Would need more qualifiers; do you want a big screen, minimum size+weight, etc?

I just got a "new" Thinkpad T530. It's a two year old model, but the last of the Thinkpads with physical mouse buttons, essential for using the Trackpoint. Got it for $550 with three year warranty after rebates; the specs are comparable to a current model. It takes up to 16GB RAM and supports up to three dedicated storage devices. In general Thinkpads run Linux very well. This was mainly for the larger screen, I saved enough I can wait for a travel computer in early 2015 based on Broadwell.