looks good, go for it, just be prepared (and I speak from personal experience) for crap drivers and low minimum fps, from my use I always prefer a strong single card, personally I'd sell the 6850 and buy a 6970 or gtx 570, or wait for the next series of cards to come out by the end of the year or sooner
no its fine as a single card but personally I would avoid mid-range crossfire, do some research there are serious minimum fps issues when considering 6850 crossfire.. If you can afford two 6850s you will be shelling out 350+ so how can you not afford a top end card, anyways I'd go for a high end single gpu, my 2 cents although if you choose to crossfire your 6850 then your rig will be fully equipped to do so.
yeah that is what im saying, but a single 6850 should be pretty good by itself, if you are not getting the performance you want and dont have the money to upgrade then the other options are start scaling back settings to get more frames per second, you can monitor fps while playing with a program such as FRAPS, give it a try
well its the nature of mid range crossfire imo, take a card whose minimum fps is not that high to begin with then add another card and you are getting less minimum fps then you were with a single card, this was my experience with crossfire 6870s, maybe im just more anal then most