Aye Smudge,
DELL are the defacto supplier for us and are loaded with XP pro as a standard platform. Vista is another name for 'bloatware'. Very memory and processor 'hungry', with no improvement in reliability. Our IT technicians don't recommend it.

Also I know of system conflicts on an Intranet between XP pro and Vista printer/copier drivers!

I also use a 'Toughbook' by Panasonic for 'fieldwork'

same as your lot do and having fallen on one with the screen face down onto a scree slope whilst running Arc9 GIS, only to pick myself and the machine up to find it still running.

No rain, so backed everything up and continued using it for a further 4 hours with a punctured screen skin. In the office, downloaded the data and sent the beast back to Panasonic in S.Wales for repair and checking. Returned within 7 working days with new screen skin, full check and remaining warranty guarenteed.

Pays your money and makes your choice mate, laptops always cost more for the miniturisation and cost more to fix when compared with a desktop bits. I wouldn't buy a laptop of my own at present, and if you need to carry data or programmes, portable data storage is 'dirt' cheap.
Tip, tip, tap, on

, Bill.