it depends on what you do with your pc.
if you game then you need a better cpu.
the phenom 2 965 would actually be a decent upgrade which is about 100 dollars.
the remaining 100 dollars you should get another 6850 and crossfire it.
this two upgrades will greatly increase the performance of your pc.
and if possible get another 4gb of ram
or if your mobo does not support cf then sell the 6850 and get the 7850