Im Currently running a 550 Watt PSU and a Nvidia 610 1Gb and it just cant handle what i would like. Ive been looking for a new one but try to stay around $100-$150. Please leave the model you would reccomend and link to store if possible.
AMD FX-6100( Six Core, 3.2Ghz)
Nvidia GT 610 1gb
8Gb Ram
550Watt PSU
500Gb 5400 RPM HDD.
Any 7770 will do for that price, if you spend a few more smedbucks you can get a 7850 for ~$170. The real question though is why the hell would you buy a 610, a bulldozer CPU, and a 5400rpm harddrive.
Your best bets are the GTX 650-Ti and the Radeon 7770 GHz Edition. The 650-Ti is faster, but also costs more. Best at $150 range, but I've noticed the 7850 encroaching in on that territory for $155 (after MIR), and the 7850 is noticably faster.
either of the 3 options would NOT require a PSU upgrade.