Premium content but I will summarize: (
http://insider.espn.go.com/nfl/draft...odd&id=4035825)
ESPN says that Texans are in one of the best positions to trade down with SD behind us in need of tackle help, and likely only one top tier tackle left on the board. Likeliest candidate would be Philly, with the proper ammunition (two first rounders give them the ability to trade thier second) and a serious tackle need.
I would agree with most of the assessment but I am not sure an OT will be available at 15. Philly would be coming up from either 21 or 28, which according to the trade chart would net either a 3, 4, and 6th, or a 2nd, 4th, 5th and 6th respectively. You might still be able to get Matthews at 21 if that is your choice.
http://www.draftcountdown.com/features/Value-Chart.php