i am offered to cards and dont know which one to go for?? GeForce 6600GT 128Mb DDR +DVI/TV PCI-X OR GeForce 6800XT 256Mb DDR +DVI/TV PCI-X And which CPU is better for gaming: Intel P4 630 3.0Ghz Skt 775 OR AMD 64-Bit 3200+...