Heres the 7850http://www.newegg.com/Product/Product.aspx?Item=N82E16814202004
and heres the 7770http://www.newegg.com/Product/Product.aspx?Item=N82E16814202023
i was told the 7850 would work in my computer so im assuming that the 7770 will to, and the 7770 has a lower price, so will the 7770 be much worse than the 7850, or is it woth the price jump?
The distance between these 2 cards is pretty large. The performance difference between these two cards is exactly why AMD will introduce a HD7790 to cover the gap.
The hierarchy so far is ...HD7850>GTX650Ti>HD7770.... So you see there is a whole performance class you'll be skipping by down-grading. The prices of the 7850's can be as low as 140 bucks (check the XFX editions, and the PowerColor editions), that's only just a bit more than a HD7770. The GTX650Ti's are always hovering >140 bucks, so those are not economically the best for performance.