2600Pro vs 8500GT vs 1950GT

I have just aquired a Gigabyte 512MB 2600Pro. Is it worth swapping with either the 256MB 8500GT in my HTPC or the 256MB 1950GT in my wifes PC, or should I flog it on eBay? It's worth pointing out that the HTPC works fine, so I don't want any hassle factor unless the benefits are really worth it.

If it's for gaming this is how I would rate it in order from best to worse:

1950gt
2600pro
8500GT

as above.

The ATi's are supposed to be good for media stuff though. I say stick the quietest in the HTPC