I have PCi o, i started upgrading then realised i was to, i would need a new motherboard, then i would need basiaclly a new everything...

Youre in the excat same situation as me crofty, and its much cheaper in the long run to get a new PC...

Think, to get a good graphics card you need eitheR:

A new motherboard which leads to buying all sorts of new shit or,
A good PCi graphics card which it still pretty shit at 128mb... but that needs at least like 700mhz processer (CPU) and if yours is like mine you dont have that either, but to get a good CPU i nee a new motherboard i think...

You see where its going? a big circle so youre buying a whole new pc but you dont know it... so either make youre own which is what you need to do basically or buy one