I have a CyberPower GX 6109 PC. I would like to upgrade the graphics card and am looking at several options. (1) - What would be a good card with the existing PSU; (2) - If I upgraded to maybe a 700 watt PSU, what would then be a good choice? The system info is: i5 2320, 3.0 Ghz, 8 GB DDR3, expandable to 16 GB, 1 TB HDD, 1 GB Nvidia Geforce GT 520, 450 PSU, Windows 7 premium 64-bit. I've been reading up on cards, but realize that my knowledge on them is very limited and all the choices are confusing. Any suggestions would be greatly appreciated. Oh, my main interest is using it for novice single monitor gaming.