I'm a Dell fan. I like HP/Compaq ok too, but I personally advise my customers to stay away from most other brands if they can help it.
Here is a perfect example of a computer that I would be leary of
Acer 17" $599 It is definitely a great price though.....
I would be comfortable with any of the following laptops. With a 15.4" screen you can definitely add some more options, warranties etc and stay under $1,000. Once you bump up to the 17" screen, you are getting very limited on your upgrade room while keeping it cheap. I have bought a few of these new Dell Vostro laptops for customers and they are very nice. I like the new matte black case too.
Dell 17" $799
Dell 17" $899
Dell 15.4" $599