currently i have :

Quad Core Q6600
2x corsair 2gb) 1066 ram
Nvidia 9800GT
Asus P5KPL-AM/PS
Vista x64 ultimate

was thinking of upgrading to

Asus P6X58D-E Intel Mainboard - 6x DDR3 / 6x Sata / Gigabit Lan / LGA 1366
i7 930
Kingston DRR3 12gb (3x4gb)
Asus ATI EAH5770CU2DI-1GD5 RADEON 5770


would it be cheap getting 8gb ram and going with win7? (cheaper + better performance)?