This is going to be my 5th and final Mock Draft for the Steelers. I don't pretend to know what is going through the minds of the Steelers' FO, but I feel that I have a decent enough perception to predict at least a few of the options that they might go for based on the MO they have showed in the past.
Round 1 - Arthur Brown, ILB, Kansas State
Despite what some people want, I don't think the Steelers are going to bring in someone to step in immediately to take over at OLB or OT. That isn't how the Steelers work. They don't like to rely heavily on rookies in Dick LeBeau's complicated Defense. Brown is viewed as a bit of a developmental player. His measurables came in eerily similar to Patrick Willis in 2007, yet he lacks the explosiveness that Willis showed (likely due to gaining 20lbs between the end of 2012 and the Combine). If he can develop that explosiveness, he could be one of the most dominating players in the NFL. That is why I believe the Steelers will take a chance on him. He can split time with Larry Foote and develop as a complete Linebacker.
Arthur Brown vs Oregon (Bowl Game - 2013) (via Adrian Ahufinger)
Alternate Picks: OG Jonathan Cooper, North Carolina; Damontre Moore, OLB, Texas A&M; OT D.J. Fluker, Alabama; TE Tyler Eifert, Notre Dame; FS Kenny Vaccaro, Texas
Round 2 - Giovani Bernard, RB, North Carolina
Bernard would be a classic Steeler pick. The Steelers are moving to a hybrid-blocking system that will incorporate both Zone and Man/Power blocking, likely in preparation to fully move to a Zone-Block due to the hiring of Jack Bicknell Jr. as their OL coach after Sean Kugler became the Head Coach of UTEP. Neither Jonathan Dwyer nor Isaac Redman are fit for Zone-blocking, so they will need to either Draft one or pick one up as an UDFA. With the increased attention put on the Run Offense by the FO, I have reason to believe that they will be looking at someone early on in the Draft. Bernard is extremely versatile, bringing a presence as a runner, returner, and pass blocker.
North Carolina RB Giovani Bernard vs Miami (FL) (via CollegeFootballLive)
Alternate Picks: Eric Reid, FS, LSU; Jordan Poyer, CB, Oregon State; John Jenkins, DT, Georgia; Vance McDonald, TE, Rice; Barrett Jones, G/C, Alabama
Round 3 - Sean Porter, OLB, Texas A&M
Sean Porter is an intriguing player. He doesn't have a set role. While at Texas A&M, he played a mix of DE and OLB, providing Pass Rush, and also playing in coverage. He seems like a jack-of-all-trades player that the Steelers could take a chance on. He plays a bit like fellow ex-Aggie Von Miller, but not on the same level obviously. Dick LeBeau loves these kinds of players. Porter could work well in tandem with Jason Worilds at James Harrison's old spot.
Sean Porter vs LA Tech (2012) (via Aaron Aloysius)
Alternate Picks: Ryan Swope, WR, Texas A&M; D.J. Swearinger, FS, South Carolina; Xavier Nixon, OT Florida; Stedman Bailey, WR, West Virginia; Jelani Jenkins, OLB, Florida
Round 4 - Josh Evans, FS, Florida
The Steelers have said that they want to add some youth at Safety. With Will Allen and Ryan Mundy going to the NFC East with the Cowboys and Giants respectively, that leaves only Robert Golden and Da'Mon Cromartie-Smith at backup, which almost assures that the Steelers will go after a Safety in the Draft. Evans is a good developmental guy for the Steelers to have behind Troy Polamalu and Ryan Clark. Evans has very good coverage ability over the top, which would be able to free up Polamalu and be the player Steeler fans have come to know and love. He is very fluid and has good lateral agility to avoid blockers when blitzing or to make the open-field tackle on a ball-carrier.
Josh Evans vs Georgia 2012 (via JPDraftJedi)
Alternate Picks: Kenny Stills, WR, Oklahoma; Le'Veon Bell, RB, Michigan State; Dion Sims, TE, Michigan State; Matt Scott, QB, Arizona; Chris Faulk, OT, LSU
Round 5 - Connor Vernon, WR, Duke
The Steelers hardly ever use a high Draft Pick on a WR, and I doubt that this year will be any different. 3rd Round at the highest is where I expect them to take a WR, but they have other needs that they could go after so 5th Round could be a good choice here with Connor Vernon. He reminds me a little of Hines Ward, without the blocking. He isn't overly fast, but is very savvy with his routes and has a good feel for finding holes in Defenses. He also has consistent hands and is good at getting open. He would be a great over-the-middle target for Ben.
Conner Vernon vs North Carolina 2012 (via xuesac84)
Alternate Picks: Jeff Locke, P, UCLA; Rontez Miles, FS, California(PA); Zach Dysert, QB, Miami(OH); T.J. Barnes, DT, Georgia; Ricky Wagner, OT, Wisconsin
Round 6 - Michael Williams, TE, Alabama
The loss of Heath Miller for at least the start of the season is going to leave a hole in the Steelers Offense, both with Blocking and Receiving. David Paulson is a good enough receiver to hold down the fort on that front, but no one is really good for blocking at TE for the Steelers. David Johnson and Matt Spaeth only signed 1-year contracts which means that their positions on the team are hardly guaranteed. Williams would be able to replace the blocking that Heath Miller often provided with his experience playing with Alabama's Offensive Line, which dominated Notre Dame's Defense in the BCS National Championship Game.
Alabama TE Michael Williams vs Notre Dame ᴴᴰ (via CollegeFootballLive)
Alternate Picks: Earl Watford, OG, James Madison; Mycah Hyde, CB, Iowa; Denard Robinson, QB/RB/WR, Michigan; Jason Weaver, OT, Southern Mississippi; Matt Stankiewitch, C, Penn State
Round 7 - Kayvon Webster, CB, South Florida
Now this is where it gets a little tricky to predict. I don't really know much about this guy, but this seems like a pick that the Steelers would make. He isn't all that big of a name, but he would provide some competition in training camp at a position that is in need of some depth after the loss of Keenan Lewis to the Saints.
KAYVON WEBSTER CAREER HIGHLIGHT (via SOUTHFLORIDAVIDEO)
Alternate Picks: Brad Wing, P, LSU; Travis Howard, CB, Ohio State; Caleb Sturgis, K, Florida; Tanner Hawkinson, OT, Kansas, Michael Mauti, ILB, Penn State
Round 7 (Compensatory Pick) - Roger Gaines, OT, Tennessee State
The Steelers need a backup OT and bringing in a guy in the 7th Round for depth would be something that the Steelers would likely do (they did it last year with Kelvin Beachum). Unfortunately, for a 7th Round OT, there aren't any highlight videos of any kind around the internet, so my perception of him is a bit lacking. All else I can tell you are his measureables. He is 6'6" 334lbs with 36 1/4" arms.
Alternate Picks: Gilbert Pena, DT, Ole Miss; Ontario McCalleb, RB, Auburn; Luke Marquardt, OT, Azusa Pacific; Ray Ray Armstrong, SS, Miami(FL)