RAM

[Lendryn]

He was already at 6GB, so he's not going to see much difference going from 6 to 12 for gaming anyways

Yeah... as I said he will probably see no difference at all. Many games are still 32-bit applications, which are limited to allocating a maximum of 2 GB (without using a hack) of memory. Unless you've got a fair amount of other crap running in the background that is actively using up your available memory then you should be fine even with 6 GB.