If mid/high end gaming is on the table i would look to hit vastly more horsepower in the GPU dept. over a 9800GT a.s.a.p and yes even at the expense of a quad as games currently arent optimised for quads over a spread of games to date
The average optimal number of CPU cores suggested by the test results is 2.75, showing a clear trend towards at least three CPU cores.The question of whether the CPU or GPU is most important is easily answered. If you don't have a multi-core CPU, then upgrade it. If you have a dual-core CPU at around 3 GHz, then invest your money into a graphics card, as most games are GPU-limited. This is not something that will change with new DirectX 11 games.