And, if you want to, get a new keyboard, mouse, speakers, and surge protector, but it's at $1850 (with dual 6870s and RAID) right now. You do have a keyboard, mouse, etc. already, right?
That's the best one that I could come up with for under $2000 with 3 monitors.
If you don't have room for 3 monitors, or prefer 1 monitor, then you could save money/get a better frame rate by getting just one monitor, and getting a single, more powerful graphics card. Maybe even get an SSD for your operating system (really fast boot times).