>This is what I understand that if I buy a new notebook with high resolution I have to include buying a new monitor for the office (where I have 19" monitor) and one for home (where I have no external monitor and work right from the notebook screen). I have not used two monitors. For that I understand I will need to buy a notebook (specify as option) with two video cards.

Try dual monitor setup and you'll never want to go back to one monitor. :)

I would look for a laptop that supports connection for the secondary monitor in dual monitor setup. Most modern video cards have 2 monitor support.