I'm liking the Artest pick up more and more each day.
Minus is odd behaviour in Chicago and Indiana, he has pretty much been a solid citizen/player in Sacramento and Houston. He fell in line with the McGrady/Ming set up and did what he was told (very well, I might add), and he will fall in line with the Kobe/Gasol setup.
Even better, Artest is a superior defender than Ariza. More importantly, Artest can defend stronger small forwards in the post, such as Carmelo Anthony (who gave the Lakers fits in the WCF this year).
The Lakers biggest potential weakness was defending the 3 spot. (think Paul Pierce, Carmelo Anthony, etc.) Artest negates that right from the start.