i have a similar setup and let me tell you...it works wonders. it depends on your video card. i currently have an analog lcd and an analog crt monitor hooked up to my video card (ati radeon 8500).

on my graphics card, it has 2 outputs - analog and dvi. since both of my monitors are analog, i had to order a dvi to analog convertor plug so i could hook up both monitors. not sure how yours is set up.

comparing dual monitors to single is like comparing broadband to 56k. once you use it, you'll never go back....so be careful