Honestly, a used 9800Pro or 6600GT from eBay would wipe the floor with either of them. Here's a better deal on a 9600XT from Newegg though.
My guess is that either card will perform similar. That's most likely just a 6800XT. It has faster memory but the core's slower speed will make it choke. It almost the opposite situation with the 9600XT. Fast core, slow memory.
A 9800Pro/6600GT from eBay would be a better buy. Just make sure to you're getting an AGP card when looking for the 6600GT
But the trouble is that im brazilian.. so i need to buy new cards, our sellers that buy in usa dont buy from ebay.. so i need to choose a card from newegg... in the newegg vgas, the best two that fits in my budget (the conversion tax from dollars to our currency is so big..)is that two...
So, between them, i am liking more the 6800XE, because the memory is bigger (256mb), better (gddr2) and faster(533 Mhz), and im sure ill can overclock the core, even a little bit, to get better performances... the 6800XE also have more pixel vertexes...
