Re: What to upgrade for best bang for buck?
its not recommended that you crossfire video cards of different models, or so i've heard. u can only cross fire cards from the same series, like 5700x series. So your only option for crossfiring you current 5770 is buying another 5770.
a crossfired 5770 is better than a 5870, and the 5870 is pretty impressive in itself, and the 5770 has better gaming capacity (less bugs/errors) than the 5870 from waht i've read in existing reviews.
SO as of right now, your only optios are:
Ditch/sell the 5770 and get a 6870 (or two if u sell the 5770), OR get another 5770 and crossfire it.
personally, i would crossfire the 5770, its overall the same price. From what ive seen and read on charts inside and outside of these forums, the 6870 is slightly better, if not equal, to the 5870, and the crossfired 5770 is better than a 5850 and has less errors in gaming than the 5870