The T4x0 is the star of the lineup. You can get last year's model dirt cheap through the Lenovo Outlet or refurbished ($500+ US). They finally give you a good screen (remember the T430 and earlier days? Or even the recent 1366x768 screens?), battery is great, the chiclet keyboard isn't as bad as people try to make you believe, and not only did they leave the TrackPoint on, the TouchPads are pretty decent even if they aren't to Apple's level.

Easily repairable or upgrade-able by the end user, thin and light...