It seems that most people on this board would do a Ray Allen+Filler/Picks for Dalembert/Iguodala in a heartbeat, so I'm going to show another option which is in my opinion more realistic a proposal AND isn't quite as bad an idea as it might seem at first glance.
BOS/PHI Trade
BOS trades: Ray+Sheed+1st rd pick
PHI trades: Iguodala+Brand
http://games.espn.go.com/nba/tradeMachine?tradeId=yha7md3Our first realistic shot of having the cap space to sign a free agent would be 2012/13 when KG's contract is off the books. Lets say we have acquired Iguodala through the Dalembert trade idea. His pay for the 2012/13 season is 15 million. Lets say after this season Pierce signs a 45 million 3 year extension or something in that ballpark, his salary for 12/13 would be around 15 million. Lets say we sign perk to a reasonable extension with his pay in 12/13 being somewhere in the 7-12 million dollar range. Rondo's pay for 12/13 is 11 million dollars. Our total salary with just these 4 players on our roster would be roughly 50 million. Estimating the cap in 12/13 to be roughly 60 million would leave us with only 10 million in cap space. Assuming we extend at least 2 of Eddie/TA/Daniels/Bill Walker/Big Baby then we will most definitely be over the cap the year KG is off the books. Meaning there is a good chance that we will NOT be signing any free agents for greater than the MLE through 12/13. This leads me to my main point...
Since we won't have any cap space to sign free agents before the 12/13 season ANYWAY then it doesn't hurt us THAT much to take on Brand's contract, which would be up after the 12/13 season. Not to mention, KG seems to be on his last leg, so it might even be beneficial to have Brand. Dumping sheed's contract on them also softens the blow a little.
I think this trade would help us THIS YEAR (andre > ray, brand > sheed) and BEYOND (Rondo/Iguodala/Perk- next big 3 anyone??).
P.S. - I know I made a lot of assumptions but they all seemed reasonable to me
Thoughts?