I'm not much for laptops, personally...I don't need to be mobile that way.
My iPhone gives me everything I need in a mobile "computer" - basic web browsing, easy access to email, and some awesome apps for on the go stuff that would be cumbersome to pull out a laptop for. (
Hot Popcorn,
Urbanspoon, etc.)
If I were to get an Apple laptop, it would likely be an aluminum MB.
If I had to go with a PC, I'd want one of the latest possible IBM Thinkpads (I know Lenovo Thinkpads are pretty good too, but IBM still made them better imho.)