Stay away from the T30. They have a lot of motherboard and disk
  failures.

I would have to concur.  I had one for 3 years that was ok until the
last 6 months, and got a new mobo to make the second ram chip work.
Then, it failed (video chip fried) after about 6 months.  Still, I
carried it around and used it daily for 3.5 years, so I was happy.
The T30 is chunkier and has more thermal issues than the T4x series.

-- 
    Greg Troxel <gdt@ir.bbn.com>