Miners will always be around and the mh you get for the value of the card is still a bargain. Don't believe me? do the math on 6990s and you'll see that 5850's are by far the best value. They're in high demand STILL and there aren't many for sale. $200 is fine, don't listen to any other lowballer stuff. If they think they can get it cheaper within reasonable time  - let them try lol.

Difficulty increase has no effect on the price of the card, its not like those ati guys are cranking out new cards just for you miners because they are aware you need more of them to keep up with bitcoin mining difficulty ROFL.