Flee far, far away from HP/CPQ and Sony. The one has customer service and support from hell, the other makes entertainingly proprietary kit that even Windows XP doesn't work right on without the Magic Sony Drivers.

Seriously, you want to consider either a Stinkpad, a Powerbook, or a Splatitude.

Of those three, I'd be after the Apple kit like a rat up a drainpipe. Build quality and service is light-years ahead of anything in the PC realm.