Interesting topic, since the OP has a 7850 as the GPU. A 7850 should be able to drive pretty much any modern game with good graphics performance. The CPU, would actually be the bottleneck in this situation, since a Core 2 duo e6700 isn't fast enough to drive a 7850.
So let's get that straight here. This is a clear CPU BOTTLENECK, not a GPU bottleneck.
Anyway, that would mean that you'd want to avoid games that are heavy on the CPU side. Grand Theft Auto 4, for example, would poorly on your system, since it has infamously high CPU usage. Battlefield 3? Would run fine single player, but have some CPU bottlenecking in multiplayer. Skyrim would have a noticeable CPU bottleneck as well, limiting FPS to about 45ish, regardless of graphics settings.
But for the most part, a high percentage of games would run flawless. Tomb Raider, for example, should run at around 75 FPS with high settings. All COD Games should run flawless, etc etc etc.