Is NVidia 7800GS a good choice for my system?

7800GS can be good for your rig.

Other card that less pricey is 7600 series. You can pick such 7600GS or 7600GT. Most users said 7600GS give more performance than GT.

From ATI is 1950 or 1600.
 
7800GS can be good for your rig.

Thanks Slice!

The one thing I was worried about is that maybe my budget PSU wouldn't be able to handle it.

But you feel confident I will have no issues?
 
The one thing I was worried about is that maybe my budget PSU wouldn't be able to handle it.

But you feel confident I will have no issues?
My system was running from a Thermaltake 420W PSU 18A on the +12v rail.
Changed the PSU now, it's the Ultra 600 from my other computer.
I had/have no problems with either PSU, just some drivers.

BTW does the X1950Pro interest you at all.