James Walker, the ESPN blogger for the AFC North, stated in a chat transcript that the Steelers have already had negotiations with Ryan Clark for an extension, even prior to the Starks signing. This indicates that the Steelers have placed a higher priority on Clark than Heath Miller, possibly because of the incresing likelihood that Miller is an RFA next year.
However, this seems to be a departure from the practices of years past. The Steelers have signed multiple players over 30 to long term deals (Farrior, Ward, Harrison, and Clark will turn 30 during this season). Also, they are signing guys at positions where they have traditionally been willing to let players go: secondary and LBs. Since this team has a proven track record, I like the idea of signing select contributors into their 30s. Personally, I think Clark is more valuable than Heath. He is not as talented as Heath, but the Steelers can win without a pass catching TE and Heath's blocking skills are replaceable. Anthony Smith showed us what happens when a Steelers FS can't play one of the most important role on the defense: prevent the deep ball.
I was hoping someone else had some information on the Clark negotiations. I haven't even heard about them until now. Seems all of the focus has been on Heath.