Unless the niners stink pretty badly I am not sure that qb is a good choice high up. First off unless that guy has really exceptional talents the costs and risks are too high and I think it would be smart to find another Nate Davis. As for the top picks, I think a top pass rusher is of the most urgent pick and then trade down for OL and safeties.
I am a bit sceptical of safety needs as the niners have some really solid young guys coming up. In fact if they convert Nate Clements to safety, there might be a waste of talent and we should put our resources into OL and Pass Rushers. IMO that second first should be used to trade down maybe twice and pick multiple OL and pass rushers. As we seem pretty well stocked in most areas, I think we need to hit the weak areas hard.
As we have pretty good cap space we can get a vet qb if needed to help out and some mediocre vets like Franklin, Sopoaga, and Evans should be replaced. Unfortunately we may only be able to replace 1. I am really not sure what the coaches see in Roman and the fact Green Bay cut him says our version of quality is not universal. I think Nate Davis at least will be a very solid backup next year. If he does nothing but select his shots he should be pretty effective.
By the way, if Crabtree is targeting to go to a certain team where he feels he will fit, He better realize that it has to be a team without a first and with good cap space. I really doubt if a team could afford Crabtree and another first. That limits his options even more. With his brilliant mind he might have figured out a way to get around that.
Any team that has already spent this years money on a first plus Crabtree's greedy demands plus another first is going out of business quick. It would not shock me to see no team selecting Crabtree as his shenanigans can have major repurcussions thruout the league. I would die laughing if he got middle rounds money next year which I think he probably deserves both on talent and attitude. If that happens his family will have to settle for used junkers instead of caddies. I suspect though from his attitude he would just buy them bus tickets.