Hello,
I want to upgrade my graphics card from ATI FireGL Z1 and here are my options:

EVGA GeForce 7800GS 256MB GDDR3 AGP
or
ATI RADEON X1950 PRO 512MB

Computer stats:
_ACPI Multiprocessor PC
_Intel Pentium 4 CPU 3.0 GHz
_Asus P4C800-E Deluxe motherboard
_4 GB of RAM
_500 Watt ATX Power supply
_Windows XP Pro, V2002

What would you recommend?
Thank you