I think Seattle's roster has turned things around well enough that the Seahawks can go BPA in the early rounds. That said, I have a preference for corner and offensive tackle early on.
Seattle has found good depth at corner late in the draft, but finding Ricard Sherman is starting to look more and more like a stroke of good luck. The next best corner was Maxwell, and Maxwell provided most of his value by making plays, not by giving blanket coverage. Most of the rest of our corners have been good as depth but exploitable as starters.
The back half of the first round has produced some good corners in recent years, so if an opportunity is there for Seattle to get a Jimmy Smith / Marcus Peters / Desmond Trufant type of talent to compliment Sherman, I think that's the move that would upgrade the team the most, if such an opportunity were available. I wouldn't want the team to draft a corner early just because, but if the right guy is there I think Seattle needs to start considering it as an option. Cornerback is currently the biggest weak spot on the team, which is saying a lot given Sherman's presence.
If not corner, then I'd like Seattle to keep a close eye on the OT group this year, it's reputed to be pretty good in 2016. Garry Gilliam is a mediocre at best run blocker and struggles in protection. It hasn't mattered as much lately because Wilson is getting the ball out in 2 seconds consistently and Thomas Rawls made our run game look good. But that doesn't mean that an upgrade at RT wouldn't benefit the run game, or help Wilson hold the ball longer when he wants to look deep.
As far as DT goes, it's an area Seattle has gotten strong results from with low end free agents and mid-round picks. The next Aaron Donald probably isn't in this draft, and if he was, he wouldn't make it into the 20s or 30s. DT is also one of the more bust-prone positions in the first round, IIRC. I think Seattle will stay the course with mid-round picks and veterans. Some of the best non-pass rushing DTs, like Terrance Knighton, signed for bargain deals in open free agency.
Only way I see them going DT in round 1 is if a DT is BPA and Seattle doesn't feel strongly about any of the alternatives and can't get a decent deal to move down.