Lenovo T410. I have been using notebooks for most of my 15 year career, starting with sharing of a monochrome Acer laptop as big as a playstation to a Thinkpad R and T series.

I have even used a laptop made by Hitachi which was heavy enough to be used as a blunt object in a murder mystery.

My current PC is a coming to 5 year old IBM ThinkCentre A52 PC that I have used for the past year inherited from my predecessor.