If you want 3 monitors, I would go with cheaper Computer LCD, I have a 26 inch LCD that is capable of 1080p , its around 300 bucks .. 900 for 3 screens, 900 for 3 ps3s.. plus Ethernet cables and all equipment necessary is 100 bucks lets say. And additional 3 games.
Total cost around 2080 and 145 dollar tax (if 7 percent) Bit pricey, but not that pricey compared to high end PCs.
Not to mention with 3 screen setup you want a high end wheel such as FANATEC or maybe some kind of LOGITECH GT version that may come out with GT5. So additional 300 - 400 bucks..
Oh wait, you need some setup like a sim chair or cockpit, another for 100-400 bucks.
For around 3 thousand dollars, you will have the ultimate sim experience!