Dual-screen multitabling system that will also run Doom3?

I'm looking to spend <= $2k. Any comments/advice much appreciated.

[Spota]

Any system that can run Doom3 will also multitable. Most (if not all) poker sites only consume a minimum amout of system resources. In fact, any system built in the last 3 years should be able to multitable.

If you get a system capable running Doom3 it will certainly run be any poker app, and multitable w\o problems.