you won't see any performance increase with the 2TB drive...(unless it's an enterprise class drive with a faster interface)...as Ripley said, if you want faster drive performance, go ssd.
is ah working better with crossfire than it use to? running triples on crossfired 6850's is just spreading the load out across the resources of 2 gpu's...not really accomplishing much in the way of performance, may even take a hit on frame rates. if you have the cash, an upgraded video card would be a better option and you would want to go 78xx or 79xx.