Here's a trade idea to bring Andris Biedrins without giving up some one of the core. He would come from the bench as the first big man, he's a very good rebounder and a defensive player, plus he would be a very good insurence in case Bosh leaves in free agency
GSW get: Amir Johnson, Eddy Curry and Jordan Hill (maybe Sonny Weems too) and saves a lot of money from the Biedrins contract
NYK get: Marcus Banks Speedy Claxton's expiring contract and saves almost 6 millions fron Curry's contract to use in next year free agency. In order to get rid of that contract they must give up Hill and take Banks.
Tor gets: Andris Biedrins, giving up Amir and Sonny but at the same time, getting rid of Banks' contract
Another possibility is:
GSW get: Jared Jeffries, Sonny Weems and Amir Johnson and saves a lot of money from Biedrins contract
NYK get: Marcus Banks, with this move they don't have to sacrifice a young player and save almost 3 mill for next year free agency
Tor gets: Andris Biedrins, giving up Amir and Sonny