Three monitors isn't very easy with a MBP. I'm not sure if it's really possible.
What I can say though is that if you want three monitors/screens you can get one minidisplayport to dvi, a usb dvi adapter, and then use the MBP as your third screen.
The USB adapter screen is going to be bleh at best. You can't really do a lot with it, but it's nice to have the real estate.
The laptop screen and the minidisplayport connected monitors will be responsive and solid.