My Lian Li case has two 650 watt power supplies which provide 1300 watts but one would be suffice to power a single 970 card. As for buying the 970, I wouldn't put out $ 350 for it as it will likely run you over $ 400 with tax. I've seen 980's selling used for 450 although they weren't the titan versions. Fact is you can buy a dedicated PS4 or an Xbox One and either one has more gaming software unless you're planning on hooking up to Steam or another service and that is more cash. Sorry, but I would not go with the 970 new or used as it will soon be on the fringe where prices are likely to drop. Best to either bite the bullet and go with a higher end MSI model with 6gb or wait until the dust settles later on this year.