They will all do what you need.
IÂ´ve had a Vaio...it was cool
My IT specialist buddy says Toshiba
Someone else asks, why not check out HP too?
...and I bought a Dell a year ago which has worked out to be an excellent decision.
So I think it doesnÂ´t really matter which one you get!
...get the one that looks the coolest, or if you are planning on being reasonably mobile...get the 14 inch.
BTW: XP can be set up on any of them but I wouldnÂ´t be concerned about that. Vista works well and you donÂ´t need to tweak it for normal needs.