Yeah same here, Oblivion maxed in 1280x1024 (TFT) , 2xAA/16x HQ AF+HDR runs very nice on my x1800 XT 512mb.
x1950pro runs it pretty well also due to having 36x shaders as you can see
here , it really is an amazing card for the price, so if your want to keep your spend to around that level then it is the one to go for, but as i said i wouldn't touch the x1950 XTX, not when the new gen 8800 GTS is cheaper than it, so if your thinking of spending that much then the GTS is the one to go for over the XTX.