Strange how you get used to the screen size very quickly though!
I have a 17" @ 1920 x 1200 (same as the desktop) laptop too and I really like working on it.
I used to like using dual 19"s one for all the refs etc and the other for the scene.
Ac Chirone said, make sure that you get 2 that are the same as its a tad irritating if they are different.
"No pressure, no diamonds" Thomas Carlyle