Some teams implode after stars are traded. But some teams (and the players) step-up after the trade and take advantage of the increased playing-time, shots, etc.
Appears that Phoenix is definitely stepping up. Stat-wise, Shawn Marion is a Top 10 player in the NBA.
Then you've got other guys (Joe Johnson, Voskuhl, Barbosa, Jacobsen) who have played well recently.
Add a healthy Stoudemire to the mix, the Suns could be a great team ATS.