My specs(in case you need them)
Pentium 4 3.4 GHz
Motherboard: ACER I91M
RAM: DDR 2560 MB PC-3200
Windows XP Home sp2
Here are some that I found:
GeCube http://www.plaisio.gr/product.aspx?cata ... ct=1042831
Connect3D
http://www.plaisio.gr/product.aspx?cata ... ct=1042815
Sapphire
http://www.plaisio.gr/product.aspx?cata ... ct=1042866
Which one is better?
If you got other propositions let me know

(The cost must be around 150 euros)