Another thing you might want to think about is the warrenty. If I was going to buy a dell I think i would go for a 2-3 year warranty. Thats really one of the good things about buying a premade device...
On both my inspiron laptops I've been very happy with their service. On the Inspiron 5000, which I was particularily rough on. I got 3 hard drives and an LCD panel replaced completely free (got on-site service too, so no need to ship it into them and lose it for awhile).
Just a thought..
Havent had any experiance with Toshiba warranties, but they might be pretty good as well.
Sagar Notebooks (
www.powernotebooks.com) probably offer alittle bit more bang for your buck than a Dell/Toshiba/Sony/IBM, but they normally tend to be desktop replacement style laptops (huge/heavy) and start at higher prices