Antoine! =)
Funny enough, this actually is the one that came to mind. When we traded an expiring (or close to expiring) Antonie, we got back a cap killing LaFrentz making 13 mill a year for [at least] 5 more years and our first round pick in the deal was freakin' Jiri Welsch. Trading Antoine was his way to come in and make his mark on the team and I thought it was quite arrogant and the wrong move at the time (and still do - Antoine was always a favorite of mine, but it seems to me that there had to be somebody else out there better and with a more reasonable contract than LaFrentz).
Since then, Danny has grown as a GM and where he has traded a player or let a player go, his replacement has been better than he. KG is the obvious one, but others like Powe and Posey, in recent years - while not popular at the time, proved to be the right decision