This guy may fall to the top of the 2nd round when they go to the combines and work out we will see who is what it's to early to tell.
I would avoid trading down too far. as a matter of fact the focus should be to stay in the first rd. for example, here is a realistic trade down scenero for ya big guy-
Texans trade with Dallas (who have two 1st rd. picks) exchange #18 for #29 & pick up Dallas 2nd rd. pick. don't know for sure the rotation on the picks after the 1st rd. but if needed could also swap 3rd picks to even out the deal.
Dallas picks
#18 (900) Reggie Smith, CB
#22 (not included in this trade) Felix Jones, RB
#82 (180) Craig Steltz, DB
= 1080
Texans picks
#29 (640) Michael Oher, LT
#69 (292) James Davis, RB
#93 (128) Trae Williams, CB
= 1060
I could throw some picks in there for ya too if you like but don't mean $#!+ @ this point but I do feel they would do this because of a need to address CB & there are not that many really good ones so if a Reggie Smith or Mike Jenkins is sitting there #18 it would be tempting (maybe for both teams) they could be assured to also address RB with #22 pick maybe Felix Jones or Jonathan Stewart.
On the other hand the Texans can address their tackle situation with the bpa & get a 2nd rd. pick in return to use on one the better RB prospects left on the 1st day of the draft. IMO