I am looking to buy a laptop (decision has to be made within a day) to replace my old Toshiba Satellite 1805. I am looking at Toshiba, IBM and Sony. I want a light computer (old one is too heavy), powerful processor, 512ram, 40+ G and wifi, CD RW (DVD is not important). I looked at IBMT42, Toshiba M200 and Sony Vaio V505, can not decide which is better.
Main concern is that I need a durable but light computer because I travel a lot.
You help is really really appreciated.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic