Wow, PCI, unlucky!
I had trouble enough a couple of years ago getting a PCI card!
It says that card is in stock, so I guess its still availible, and its around the best you'll get for PCI.
To be honest, if you are looking to play modern games, you'll need ATLEAST an ATI X700 or GeForce 6600.
Might I suggest getting a whole new system piece by piece? This depends on how fast you can get each bit, if your earnings that you can throw at a PC are like mine, by the time you've saved up enough for the next piece, the previous is outdated!
~M