6950 can unlock to 6970 that's for sure, nothing has been said about 6850s afaik. So maybe ppl read too fast, or maybe I'm just wrong.
Now on topic, I'd personally go for the first rig, because well, even an unlocked and oc'ed 6850 has nothing on a good oc'ed gtx460. Then about the CPU, sure you get 2 more cores, woopy freakin doo, it won't improve your gaming experience at all, there are few games out there using 4 cores, let alone 6. Then, the RAM, my personal choice would go towards the Corsair, coz I never had any issue with them and I know these modules are good as far as oc'ing is concerned. Then the HDDs, between a Caviar Black 1TB and a 500GB Barracuda, I'd take the Western Digital any day.
So yeah, first rig has my preference. Then again, it's a few bucks more than the others...
Edited by eXe.Lilith - 12/27/10 at 5:09pm