Thanks sounds like good idea! Going to go get new Gaming Desktop/Semi-Rig so probably going to get awesome graphics card. Thanks for advice much appreciated 
Nvidia GPUs aren't worth it these days, you'll never make as much as you spend on power.
What you want in an ideal world is a 7970 or similar, undervolt it and enjoy your 5Mh/s per watt or so
Oh, and use somewhere other than deepbit, those fees add up
