Is this just a gaming computer? if so, check out Sandy bridge, or changing to a phenom 955....
Hitachi 7200 rpm 16 mb cache 500 gig HDD x 2
I assume the X2 means you are doiing RAID.... first, don't get Hitachi! get spinpoint F3... second, a SSD with a larger storage drive would be smarter!
Kingwin 750 watt atx crossfire x ready psu
I don't really like Kingwin... I'd go for a corsair 650 watt PSU, make sure it is certified, but that is a minimum, I'd still say go for 750+ watts... make sure it is certified..
ati radeon HD5770 video card x 2
One higher end GPU would be better because later on you can do crossfire...
Coolit systems ECO liquid cpu cooler
if this is your first build, stay away from Liquid... I'd go for a coolermaster H212....
antec dreamer mid sized case.
full size case... antec 300 is good...
What would be good memory to go with this set up? cant decide on 6, 8, or 16 gig. what would be good thats not massively expensive and compatable?
=o, you don't NEED more then 4 gigs, if you are going to do video editing(not just the occasional vid), then look at more... 6 gigs is for core i7s... 4 gigs 1600mhz g.skill RAM is great!