I don't know how fast the Radeon 9200 is, but i bet its the same class like the Nvidia 5200 FX witch sucks. I testet a 5200 and I get half the fps in glxgears than on my old but great GF2 Ti200 its the same in any other simple opengl benchmark. If the games/benchmarks are more complex the results get closer to each other. But over all the 5200FX seams slower.
If it just for gaming i suggest you a real fast videocard (a GF FX Ultra or Radeon Pro/XT) The Mainstream cards are all to slow on memory access. The CPU seams quite good enough for me. If you look at the requirements on some windows game boxes, you'll hardly find a game that realy needs more power.
The advantage of a CPU upgrade would be that all applications would benefit of it.
Its your choice anyway ...
