My only reservation about getting Brand is that the rest of the team(aside from Miller and Sam) are really a few years from their peaks.
I honestly think that Thad, Lou, Iguodala, Sam, Smith and maybe Speights will be enough jumpshooting to effectively spread the floor. Not nexts year, but more like 2-3 years from now. Unfortunity, going with Brannd puts the emphasis on winning in the next 2-3 years, and I don't know if those players will have refined their jumpers enough.
Either way it will be good to add a sniper- and hopefully that need can be addressed even if the team is up against the cap.