I don't think I'm overrating his trade value by saying that the Spurs don't really have what the Suns are looking for, besides the fact that the Suns would never trade a player of Amare's caliber to a Western Conference rival.
Also, I don't think I'm overrating his trade value by saying he's a very large improvement over Yi Jianlian. I mean, seriously. Amare generally averages 21 and 9 while shooting 55%. Compare that to tissue-soft Yi, who averages 15 and 7 on 42% shooting, while playing the same minutes. It's laughable to even compare the two players. Regardless of what general Spurfan bias might dictate, Yi is a worse defender than Amare Stoudemire.
The Suns' primary weakness on the defensive end these past couple of years has been on the perimeter. Nash and JRich can't defend worth a , and Grant Hill is too old.