Just a few personal opinion.
Fans may yell blow-out and rebuild, but for Sarver and Kerr, they'll still try to save this season, it is their job. So :
Hold on to Nash. Because change the team leader and floor general mid-season is hugely risky.
Trade for role players. This team has already got too many stars, more than enough fire power even minus Amare. Young player with high potential and/or high draft pick must be included in the deal, but quality role player who can make immediate impact is not any less important.
Be very careful if there is a star on table. We should prefer role players, but if there is Bosh or Dirk on table, we can't just say no. Make sure this guy wants to win more than anything, and will change himself for the team. We had enough big ego.
A few other thoughts.
Remember the undrafted Haslem helped Shaq and Wade to win in 2006? It is easy to find a PF to fit Shaq. A, Got to be fully committed in defence, not necessarily a skilled/talent defender. B, always fight hard for rebounds. C, Make open mid-range jumpers consistently. I know a number of PFs in that range.
A defensive PG is wanted and Barbosa is expendable. It's proven LB can't help to cut down Nash's minutes, and we want more defence. I prefer to keep LB as our 6th man, but we'll have see how a deal unfold.