I run 3 22" monitors off of a Thinkpad T420s (optimus card) in a docking station for my temporary setup (vacation home). They are Viewsonic VX2250-wm, $150 each from Amazon. Works nicely for a plug and play system, heat is somewhat of a concern, but a fan control software helps out. Not suitable for a permanent rig though, for that I have a system from digital tigers.
A few issues here: 1. The Firepro 2460 is for desktop computers and will not work on a laptop 2. This card is already obsolete 3. The card is substantially is overpriced. If you want to run multiple monitors from a laptop you will need USB Monitor Adapter cards...Kensington makes a very good one...you can add 1 monitor per usb port
A desktop will save you money. There is no reasoning in having just a laptop. Your desktop processor will be way better (and cheaper) than your laptop. The i7 laptop processors are crap compared to the i7 desktop processors.