I have 2 monitors and 2 video cards. Go to your local computer guru and see if he has an old POS video card for use on your second monitor. heck- they'll often give it to you for free just to get ride of it :)

Consider- the second monitor dosen't need a high refresh rate for things like poser of photoshop or what-ever control panels.
 Rendering and videos are almost allways done on the main screen  :)

On mine the programs control panels and all my shortcuts are over on the side monitor.

I'll never go back myself. Wonderfull must have system :)

Ken