Well as you know the the current GPU kinda dated and was a mid-low card when it was new so you won't be running many big recent game above low. What card you looking at replacing it with?
There are however plenty of indie and old games that you should be able to run fine. If you want something like Diablo you could look into Titan Quest and Torchlight probably the best games of the style since D2 and you should be able to run them both on high to max. Mount & Blade can be tonne of fun (get waband or with fire and sword not the original) and are not to GPU heavy and should run nicely on high. Minecraft/Terraria would both run great and offer something different to most games. The first Crysis should run ok at mid to low and is widely regarded as better than 2 tho I have only played the first and liked it well enough but it's not exactly a "great" game. Anything Source engine should run on mid to high depending on age. Starcraft 2 should run on low to mid. And that is about all I can think of ATM
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