I'm not from US either. I'm from Bulgaria, Eastern Europe and here local dealers sell 5850 for $288 
That's why im currently looking to buy used card and a power supply. And... yeah maybe I will stick with my 5770 + hopefully 5850 as this will be the cheapest mining upgrade.
That's why im currently looking to buy used card and a power supply. And... yeah maybe I will stick with my 5770 + hopefully 5850 as this will be the cheapest mining upgrade.Then def have a look at the 5830 and see if the price is lower I'd say - either way with 2 cards I fear that you'll need to get a new power supply regardless.