Yeah docking stations are the bomb, only problem is you are limited and have to buy a laptop with the 'docking port' under it. (Dell latitudes etc) would be awesome for a home desktop/laptop solution though.
Like this, then chuck a Dell monitor on, attach a keyboard and mouse to dock, done.
http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=330-0874
I agree I wouldn't go over 15" or be a pain in the ass to move around