I've got an old-ish HP Pavilion (dv5000). It's a full-size, 15" model. Good for videos, great for typing (keyboard's full-size), but not great for portability (it's BIG) or bettery life (3 hours max on a brand-new battery). If portability is a primary concern for you, stay away from desktop replacements, and look in the 12-14" range.
If you want battery life, I don't recommend a Turion based laptop. That thing runs hot and guzzles power.
Forget about netbooks if you're going to be doing serious typing, unless it's one of the few with a really good keyboard.
If you can, wait until you can say you're a student (and back that up with something like a student ID), then buy a laptop. A lot of manufacturers give discounts to students.
Lenovo's ThinkPad SL400 looks pretty good. If you have the cash, get a MacBook and a retail copy of XP. You'll get the best of both worlds, and they do give you pretty good graphics and CPU performance for the price. (Even the cheap model gives you a 2 ghz C2D P7350, Geforce 9400m, 120 gig HD, 1066MHz FSB,and 2 GB of RAM.)