I built this in mid December after spending quite a while gathering the parts. I plan on using it as a mostly gaming rig and if I ever get around to it maybe building my own games. I know that the 5830's are a little outdated but I got them off craigslist for $45 each. I got the 16GB RAM for $52, the 3570K from Microcenter for $180, and the HDD and SSD for $65 and $70 respectively. All told I spent just under $800 on it.
I haven't done a whole lot of benchmarking, but it was running Far Cry 2 at 90-120FPS, and Assassin's creed 3 at 30-50FPS. On max settings of course.