5850 in US: 299-370. 5870 in US: 420+, 5770 - $150-160. I personally went with 2x 5770 and am now running clocked over a single 5870. That being said if you are not the type to constantly upgrade, 2x 5770 should do you fine till the 6000 series.
im gonna go with the 5850, so i can upgrade, and i have found an xfx xxx edition 5850 for a good price. Thanks for advice
good decision. purely on performance, 5770's CF would perform slightly better, but no upgrade path.