Just be careful. After sifting through info on here, I found out that a 9600XT was the most advanced vid card I could upgrade to (I forget the technical reasons why...think it had to do with mobo & chipset). Anyway, you may not have done as bad as you think.
I'm afraid I'm done with component upgrading on this pc...P4 1.3 ghz cpu with 256k RDR RAM just won't cut it. For me to add additional RAM is another $300 for the RDR crap Dell said was so hot. At that point, I might as well invest in a screamer.