Looking at a 5850 at this point. Just trying to justify the price.
I would recommend limping along on a single card for the next ten or so days.
Fermi is slated to be released towards the end of the month and the buzz is that it will probably be priced fairly competitively with ATI's offerings.
Expect the price wars to begin soon
Yeah, it is unfortunate but GPU failures can happen.
Sometimes you get lucky and they last forever, other times something just fails...
See if you can locate your invoice for it.
If it is still under warranty, RMA it then sell the new card to help offset the cost of your upgrade.