Will look at changing the HDD on the higher ends, but the Barracudas are known for cheap reliability and Spinpoints as excellent drives as well. We went for pure price on the P35-DS3L (more often than not it is on a lowered price) and personal use. Though the TRUE, Vendetta 2, and Xigmatech are all good and reccomended, I put the Tuniq on their because I have personal experience with it and it is reccomended a lot even now.
Oh and not to mention, from all the reviews I've been reading lately and posts I've seen, the new Sunbeam (Tuniq) is doing quite well. Apparently it is selling fast over at Petra's as well

Also, I need to get around to updating deactivated links and possibly the Ultra-tier for Crossfire.