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I was considdering this and opted for the 2x5770 as they are considderably faster than the 5850. Only gofor the 5850 if you are seriously going to add another later or cannot do dual gpu solutions for any reason. I don't buy into the add another later mantra, i could add another 4870 now but prefer to sell the old and buy the new, gaining features and usually lower power usage.
Yea, two 5770s can currently be had for less than one 5850, in that case you are better off buying two 5770s, unless of course you are rich and dont mind paying for a pair of 5850s which is what I meant to say before![]()

I'd probably upgrade to newer tech before adding another 5850..![]()

In that case, 2 x 5770s, since they wont depreciate as much as the 5850 will, so you wont lose as much money when selling them![]()