The only way that I could see the Warriors getting an All Star center would be through a three way trade between the Warriors, Magic, and Lakers. Although we would lose Monta and David Lee we would end up with a much stronger frontcourt defensively and offensively with Bynum and Udoh (starting to show he has the ability to score well).
The way that the trade should look is:
Orlando does this trade to improve upon their backcourt and possibly play Monta as pg and upgrades their SF position with Matt Barnes. They also receive Pau Gasol to play as center alongside Ryan Anderson. Overall through this trade Orlando would become a better overall team.
Lakers do this trade for Dwight Howard to be their new C and they will have David Lee to replace their loss of Pau so they cannot complain about losing both Bynum and Pau. Additionally they receive another potential PG to possibly help the teams PG problems.
Warriors do this trade to get Bynum at center. Although losing both David Lee and Monta may look painful, I believe it would be well worth it with a starting frontcourt of Bynum and Udoh. They would be one of the greatest defensive frontcourts ever. Additionally the loss of Monta would not be so bad with the potential rise of Klay Thompson. I have seen flashes of what Klay can do, and I believe he could be an excellent starting SG.
Our final lineup should look like this:
PG: Curry/ Robinson
SG: Thompson/ Rush
SF: D Wright/ Mcguire/ C Wright
PF: Udoh/ Davis
C: Bynum/ Brown/ Biedrins
Just to show that it all works financially: http://games.espn.go.com/nba/tradeMachine?tradeId=7yzyan6