Specs for that system only list a 220 watt power supply. I don't think you're going to find a great card. Additionally, you're looking at a single core 1.8Ghz Intel Celeron G460 CPU. Even if you could get a decent card to work on that power supply, it'd be held back by the lack of processing power.
Sorry, but I wouldn't recommend any kind of gaming card for that system.
-Wolf sends