I doubt we need to grab an interior lineman in the 1st round, unless it's Iupati, who is a borderline 1st/2nd rounder right now. The other guys will probably go 2nd/3rd round.
Chicago has no 1st and no 2nd round pick. SF needs a RT to complement Joe Staley more than an interior lineman. They took Chilo Rachal from USC at OG in the 2nd round (#39) in 2008, and they took Dave Baas in the 2nd round in 2005 (#33, after we took Mankins at #32, who SF was said to covet), so they have 2 relatively young guards. It's much more likely that they target someone like Brian Bulaga (if he declares) or Anthony Davis (who declared today) as a RT to complement Staley.
Pittsburgh definitely needs interior line help, unless they move Willie Colon to RG, in which case they need RT help. Some have suggested that Max Starks doesn't have the footwork for LT, so they could move Colon inside and Starks to RT, in which case they would need a LT. Any way you slice it, I think there's a decent chance they take some kind of lineman in the first 2 rounds.
KC could definitely use line help somewhere as well. There's been some discussion as to whether Branden Albert is better suited at tackle or guard, so they could be more in the market for a tackle than an interior lineman. Russell Okung is a possibility early in the 1st round if they go OT, or they could go OG in the 2nd or early 3rd round.
Other teams that could use lineman include Detroit (more LT than anything else), Dallas (who needs a successor to Flozell Adams and could target someone like Anthony Davis, who fits their profile for massive linemen), Seattle (who needs a successor to Walter Jones and could also use help inside), and Washington (whose whole OL is a mess).
But with that number of prospects, there should be no need to jump in the 1st round on an interior lineman unless someone really stands out. I currently grade Iupati, Carimi (who hasn't declared yet) and Ducasse all about equal, so personally I'd rather target one OL and two DE/OLBs in the 2nd round, and go after a blue chip prospect in the 1st round, with a possible trade up.