I have a dell inspiron 600m personally and I love it. Everyone here seems to love the IBM T40, and I suppose if price didn't matter I might have gone with one. I got my dell for around 1200 after rebates and discounts.
specs:
P-M 1.4ghz
256mb ram (upgraded to 640 via crucial)
30gb 4200 rpm hdd
64mb ATI 9000m
14" XGA screen
price included 3 year next business day warrenty with complete care.
I have contacted their tech support twice, both times they were helpful and prompt (although from india if you care, no problem understanding their english).
Only 1 minor problem, the left side of the keyboard had a little too much give to it, put a small piece of paper folded over twice between the keyboard and expansion card slot and now it's perfect.
RAM slot on bottom tends to run warm.