Ok the other GTX 460 died today.

I'm returning it to Newegg and the question of the day is;

I have a $270.00 credit to get a higher end card or just let them replace these two cards? I'm looking for the most credits. Can I purchase one Fermi card that will match 2 GTX 460's for around $270.00? How much higher would I have to go to get one card that does what 2 cards can do?

One card will mean freeing up a pci-e slot for the future. But I don't wish to sacrifice credits today.

I'm going to put in an ATI card in this box. What could the problem be? I'm plugged into a power strip with a breaker so I don't think it's that. I'm fairly confidant that it's not a mb issue or a ps problem as everything else did not burn out. The cards that died were in different slots in the mb. I'm going to wait for a few suggestions from you guys before I call newEgg. Thanks for the help.