Which would be the better card for me to upgrade to? It has to
be one or the other because I'm not buying a new power supply, or
getting an nVidia card. Research with my brother-in-law seems to show
the X850 is better, but I want to ask here too. My system specs below:

Dell Dimension 8400
3Ghz Pentium 4 with hyperthreading
2GB DDR2 RAM
ATI X300 SE 128MB RAM (current card)

Thank you!

Frederick J. Barnett http://www.eatel.net/~fred/
"Someone's got to take the responsibility if the job's going to get done!! Do you think that's easy?!" Gregory Peck - The Guns Of Navarone