Hahaha! I already got 5.something odd TB of space at the mo (externals & internals) which is virtually full, but with these I'll be giving 2TB of my internals to my Dad whilst keeping some externals as back-ups. So that means I'll have over 10-12TB of space which should last a while at leastyeh i want 9.336 TB now :'(
Should be a sweet upgrade NVP - your 512MB 4870 can finally lay to rest. First thing to do, after what others have said, is to maybe see how your rails/volts are with all the new stuff in at stock. If everything is fine, then consider overclocking - though your Q6600 does run quite hot I think. What HSF do you have?