move to Windows Vista or stay on Windows XP

Hello everyone, I know I already asked this but I have decided to buy a license and I know what to take, I play a lot in the last games, COD5, GTA4, Crysis ... and I make 3d with 3ds max, photoshop and illustrator. I was advised to take both the Operating System and make a dualboot but both expensive license!!

What good configuration do you have as you play such high end games and also make 3d animations. If you have such high end rig then I wonder why cant you buy Two Operating Systems. lolzz

my config: Core 2 Quad Q6600, 4GB DDR, 500GB SATA2 HDD, 8800GTS 512Mb, asus P5E