1995.Chicago trades Will Perdue to San Antonio for Dennis Rodman
Coach Poppovitch wanted Rodman out, and well, at last he managed. But it was a kind of a bid for the Bulls, cause at that time Rodman was considered as a player who could cause trouble in the team.
1984.Boston trades Gerald Henderson to Seattle for a first round pick
The idea was twofold: 1) Open up more playing time for Danny Ainge; and 2) Hope that the Sonics would deteriorate and ultimately provide the Celtics with a prime pick.
The Sonics could not have cooperated much better. They won 31 games in the 1985-86 season and finished second in the lottery. The Celtics, winners of 67 regular-season games and their 16th NBA title, would have the No. 2 pick in the draft.
This trade was excellent until the Celtics drafted with that pick Len Bias, a very promising player who died of an overdose 2 days after he was drafted
source: http://www.boston.com/sports/articles/2 ... have_been/
2004.Detroit gets Rasheed Wallace in a three-team trade
The Pistons knew they could win as soon as they got Wallace. The Pistons didn't lost any significant players in this trade, even Lindsey Hunter, who was part of the trade, was quickly released by the Celtics and came back to Detroit.
2000. Indiana trades Dale Davis for Jermaine O'Neal
A great bid, after 4 years in the league, O'Neal was a disappointing prospect while Davis was an established veteran. Davis was still productive after, but it's far from looking like
2000. Detroit trades Grant Hill to Orlando for Ben Wallace
I think it's one of the best trade ever cause at that time everyone though that was Orlando who made the steal. 4 years later and one NBA title after, you can't say the same even if Grant Hill actually looks like to recover.
1987. Chicago trades Olden Polynice for Scottie Pippen
No need to comment the trade, I just wans to add that Seattle owned this pick from New York, after they traded Gerald Henderson (read above). Looks like Henderson was a kind of a curse for the Sonics

For sure, I forgot a lot of "best trades". Feel free to mention them
