cheap windows 7 laptop for remote to work?

i use cisco vpn and windows remote desktop to remote into my PC at work from my vaio off site. i'd like to buy another laptop to dedicated to this purpose. it just needs to be XP SP3+, vista (32 or 64) SP2+, or windows 7 (32 or 64) and support a high speed connection. the vaio does well on my N wireless. i don't think this new one needs much in the way of power since most of the processing happens on the remote PC.