A $200 video card will do fine for WoW, it is not a heavy graphic game. If you also want to run the latest FPS then you might want a slightly better card.

Stack RAM will work fine, you have to Major O/C the CPU to catch up with the FSB and RAM numbers.

If I were building a system right now with no parts to upgrade with (drives always upgrade) I would go with i7 system. It costs more but has a lot more upgrade/future proofing on it.