Ok, I have most of my PC parts now. I currently have a AMD Phantom II X4 965 Processor, an ASUS AM3 Mobo with support up to 16GB of DDR3 1800 RAM, Sony CD/DVD Burner, an OCZ 550w power supply, and an Antec ATX case. I'm also buying an ATI Radeon 5770 1GB Graphics card. I'm wondering if I should go with just 4GB of RAM of DDR3 1600 or get 6GB of DDR3 1600. Is it worth the cash to get the extra 2GB? How much will it affect game performance in games like Crysis?