Radeon 9600pro vs. Geforce 6200

I have a 9600pro right now, but it's dying. Unfortunately, the warranty ran out a while ago. How does the nVidia Geforce 6200 compare? I know on some of the older cards you can unlock some extra pipelines, but without that, how would it fare? I don't have a mobo with PCI-Express. I wanted to get a 6200 with 256MB of RAM, as opposed to the 128MB I have already. I don't do much gaming, but I did get Oblivion and you all know how much power it needs. Any other recommendations? I was thinking of getting it used, any places other than eBay? Thanks.

EDIT: I'd like to spend <$70, if at all possible.

The 6200 wouldn't be as good as a 9600pro. The amount of memory does nothing for it. I don't believe it can be unlocked.

To do better than a 9600pro, you would need at least a 6600.