It's kind of early, but Mike Mazzeo of ESPN New York has decided to rank the top ten trades in Nets history...including the ABA days. In his estimation, the trade that sent Devin Harris, Derrick Favors, two first round picks and $3 million to Utah for Deron Williams is their third best ever.
His top two (which would be hard to argue) were the August 1973 trade that brought Julius Erving from the Virginia Squires and the July 2001 Jason Kidd - Stephon Marbury deal. Vince Carter for trinkets and baubles in December 2004 ranks fifth.
Top 10 trades in Nets' history - Mike Mazzeo - ESPN New York