With a 220V PSU, I'm guessing you are not in the USA, so I won't post specific Newegg links. Unless you want to rebuild your entire system, in your place I would not buy any GPU stronger than a HD6770. A HD7750 would be good too. If money is tight, as little as a HD6670 (GDDR5 version) would be acceptable. All in all, you will still need to lower some settings to play the most recent games, but you should still be able to play them with decent settings.