Last upgrade to my PC

I'm looking to do one final upgrade to my PC and I'm wondering if you can assist me in picking out a GPU.

First, I'm looking for an AGP GPU.

Second, I'm a bit partial to the ATI boards as I've had better luck with them as they seem to have better DirectX support.

What I'm curious about is how different ATI card perform in relation to others.

For example, from what I can tell, the X1300 card isn't all that much better than the X800 even though it's part of the newer generation.

Basically performance wise, what's going to be better X800, X1300, X1650, or X1950 all of which I can get with an AGP interface.  I don't think I'd go with the X1300 at all but I would like to know performance-wise how the X800, X1650, and X1950 all relate to each other.

Thanks

http://www23.tomshardware.com/graphics.html?modelx=33&model1=543&model2=607&chart=199

 This will tell you what the best card is.

I really would recommend just saving for a new system....I made the mistake of trying to revive my agp system last summer =P....I just bought a new system this weekend ;)

I've been running an x800GTO, which was pretty decent. It doesn't support SM3.0, but I ran most games on medium-high (usually w/o most AA etc) at 1680x1050 if that helps at all.