The $79 I think is the TX which is a good one, No you don't need the $200 one. OK I just looked and the $79 one is the CX series, OK but doesn't have as good of quality built in and they are made by someone else for corsair, There ok but for $10 more you can have a much better unit CORSAIR TX Series CMPSU-650TX 650W ATX12V / EPS12V SLI 80 PLUS BRONZE Certified Power Supply - Newegg.com This is the one I've been usung for about 7 years now and it's handled a lot of power draw and higher end graphics cards with no issues.
Dauntae
Dauntae