This is the build so far, thanks for the suggestions guys, because of you I ended up going with the 212 heatsink with matching push and pull fans :)
Only one 6870 for now, will be going crossfire if the one cant handle arma 2 on its own.
I will not be running a case, its going to be mounted on shelving with the video cables running out the wall to the desk and bluetooth mouse and keyboard.
I am thinking of SSD's now, I noticed that people are reporting high failure rates with the sandforce drives?
I would like to get two 60gb ssd's and run them in raid, would the onboard motherboard raid controller be good enough for this?
I appreciate all the help so far!