Here are the positions that I think the Texans need to look at during the Draft and why. They are not necessarily listed in area of importance.
Running Back - IMO, this was the single worst area for the Texans last year. The running game was deplorable. The good side is that it is the one area where a single solid draft pick can fix a lot of things. For that reason, I see the Texans taking either Adrian Peterson or Marshawn Lynch with the #8 pick. A running game will bring consistency and balance to the offense.
Center - From what I hear, Spenser is recovering well and likely to return as the starting left tackle. Winston will be playing his second year at right tackle. The Texans have two capable guards in Weary and Pitts. But they don't have a center. Flanagan, who was brought onto the Texans for his personality, veteran status, and pro-bowl years, struggled last year when he was not injured. Hodgdon looked lost the few times he was out there last season. The Texans' last hole in the line is a center. I like Doug Datish from OSU as a second- or third-rounder. I see the season starting McKinney at Center with the drafted center switching out plays until he's comfortable starting for the team.
Defensive Tackle - Maurice Jones-Drew, Larry Johnson, Deuce McAllister, Reggie Bush (!), LaDamian Tomlinson, Michael Vick, Cadillac Williams...Somebody has to stop them because they are all on next year's schedule. I doubt TJ is the guy to do it. The Texans could decide to take Alan Branch instead of a running back (assuming he's there at #8), and I would not be surprised or think it's a bad decision. The problem is that I think the Texans will take a Running Back in the first, and I think it will be slim pickings after the first or second round. So this could be the second-rounder, or the free-agency acquisition.
Cornerback/Safety - The Texans have suffered greatly the past few years because they didn't have a defensive secondary. Along with the running game, defensive secondary is the biggest weakness, and I don't think a new DE will fix it. The talent just begs to be upgraded here. On the plus side, there are a lot of cornerbacks and safeties this year, so the Texans should be able to pick a decent one up in the later rounds. However, the thing to consider again is that the Texans need that DT. And although the AFC South started as a pass-happy division with Leftwich, McNair, and Manning, this year changed. Insert Vince Young, remove Leftwich. Peyton struggled. As much as the Texans desperately need this, I see it falling to a later round. Third - Sixth.
Linebacker - If Demeco improves, he will be one of the best linebackers in the AFC and in the league. I think the Texans are betting on this, as there are bigger needs than another linebacker. I see this as another second-day pick, but it could also be addressed during free agency if defensive tackle is not.
I don't think the Texans will trade for more picks at this point. They have a tight budget this year, and they need two to three impact players, with others there more for depth now.
I left it a bit open (i.e., linebacker in the "second day," center/defensive tackle in second round) because this is where I think BPA will factor in. I don't have specific picks yet (except for #8) because we have yet to hear from the combine and Free Agency, which will affect the Texans' selections.