I took a look at the list of visiting players (at the end of the post) and took a look at what kind of mock I could make out of the list.  Some pretty decent options IMO.  Note that this list doesn't include the local guys who visit for free.

Of the 25 visits on the list to date:

CB: 6

NT: 5

WR: 5

OL: 4

RB: 2

DE: 1

LB: 1

   5 NT Prospects is a lot but 3 of the guys are late rounders - kind of in line with my thoughts that they'll go prospecting for a late round gem since Hampton is signed for 2 more years.  Kind of interesting that they've seen so many WR (although all mid to late rounders) and only 1 LB so far.  Also only 1 DE prospect brought in (Cam Jordan) and he's a long shot to even be available to the Steelers.  (Note that free visiting Pitt guys Romeus and Sheard are legit candidates for DE and OLB respectively though)

Option 1 

1. Cam Jordan DE
2. Curtis Brown CB
3. James Carpenter OT/OG
4. Julius Thomas TE
5. Mario Harvey LB
6. Anthony Gray NT
7. Dwight Daisher WR

Option 2 - 

1. Phil Taylor NT
2. Rodney Hudson OG
3. Johnny Patrick CB
4. Jarriel King OT
5. Taiwan Jones RB
6. Cortez Allen CB
7. Tyler Beiler WR

Option 3

1. Ras-I CB
2. Marcus Gilbert OT/OG
3. Kendrick Ellis NT
4. Austin Pettis WR
5. Da'Rel Scott RB
6. Cortez Allen CB
7. Tyler Beiler WR

The list with guess on round

Baylor defensive tackle Phil Taylor, NT, round 1

California defensive end Cameron Jordan, DE, round 1

Virginia cornerback Ras-I Dowling, CB, round 1

Florida offensive tackle Marcus Gilbert, OT OG, round 2

Florida State center/guard Rodney Hudson, OG, round 2

Texas cornerback Curtis Brown, CB, round 2

Abilene Christian wide receiver Edmund Gates, WR, round 3

Alabama tackle/guard James Carpenter, OT OG, round 3

Hampton defensive tackle Kendrick Ellis, NT, round 3

Louisville cornerback Johnny Patrick, CB, round 3

Boise State wide receiver Austin Pettis, WR, round 4

Portland State tight end Julius Thomas, TE, round 4

South Carolina offensive tackle Jarriel King, OT OG, round 4

Tennessee-Chattanooga cornerback Buster Skrine, CB, round 4

Utah State cornerback Curtis Marsh, CB, round 4

Eastern Washington running back Taiwan Jones, RB, round 5

Marshall linebacker Mario Harvey, LB, round 5

Maryland running back Da’Rel Scott, RB, round 5

Tennessee wide receiver Denarius Moore, WR, round 5

Alabama A&M defensive tackle Frank Kearse, NT, round 6

Auburn defensive tackle Zach Clayton, NT, round 6

Citadel cornerback Cortez Allen, CB, round 6

Southern Miss defensive tackle Anthony Gray, NT, round 6

Bridgewarter wide receiver Tyler Beiler, WR, round 7

Middle Tennessee quarterback/receiver Dwight Daisher, WR, round 8