Currently have a 2.8 Expresscard UMBP as my main machine, and a base Rev. B Air as a secondary/work machine. Was thinking about ditching the Air and going with another MBP as a secondary workhorse. I can get a classic 2.5/2/250 refurb'd for $1500, or a 2.53/4/320 new expresscard UMBP for the same price. Obviously the Uni is the better machine all around with better RAM/Graphics/etc etc but at the same time it would be nice to have one of those beautiful classic machines as I already have a UMBP, and it would of course only be a secondary machine. Which would you go with and why?