We're not bringing in Soliai. That's not how the plan is laying out from my observations of Buddy and Chan. They drafted their NT last year along with their DE in Troup and Carrington respectively. Remember that Chan and Buddy both feel the players in year two are the ones who will really help the team, not rooks. They are not going to drop big bucks on what they think we already have.
IMO, the line will be Troup NT, KW at DE an Edwards and Carrington at DE, unless they feel Dareus is too awesome to pass up. Stroud is done. They are going to concentrate on ILB and OLB. They won't resign Poz and go for bigger, stronger ILB's in FA and in the draft. (little chance Harris will be available but that would be a helluva pick up) They will likely draft another OLB and use Merriman on one side and Moats working in as back up. I agree that guard is a long shot, but we really need a competent RT that can run block. So that may come in the draft of FA or trade.
Honestly, looking at how they have acted and what they say, I don't think we'll see a ton of movement on the DL. They feel they have the pieces an that our LB's flat out suck, which is hard to argue.