Try
CNET\'s Laptop Buying Guide . You can tell it what you're looking for, and it'll help you figure out what you need.
Personally, I like to get comps loaded with just about as much as I can stick into them (in terms of processor speed, RAM, and, to a lesser degree, graphics cards). Not absolutely top-of-the-line (which is very expensive), but not far from it. You pay more than you would for a basic comp, but you get a comp that'll last years longer. The computer I'm using now is 7 years old. It's only recently started to become noticeably slow. I probably should have replaced it last year, but for the usage it gets, it's got another year or two in it, I think. Much better than the 3 or 4 years (if that) I'd have gotten out of a lesser comp.
In any case... As you can see, CNET recommends at least 1GB of RAM now. If you check the
Windows Vista Upgrade Advisor , you'll see that it's the minimum suggested for even casual Vista users (Vista is a
huge memory hog, especially the fancier versions). Microsoft
claims you can get away with less , but the reviews I've seen haven't really agreed. In fact, you'd probably be better off with 2GB.
Hard drive... DVDs usually hold a few gigs each. If you want entire movies, you'll need a lot of space. But that's okay. You don't have to worry about it right now. You can get a high-capacity external hard drive in just about any size you want for about $1/gig. Some will be cheaper than others, some faster than others. I recently got a 250 gig drive on sale from Circuit City (they have weekly specials on external HDDs) for about $70. It's a little on the slow side in terms of access speed, but it works well enough. Much cheaper than buying a huge-capacity laptop drive.
Also, you shouldn't have much trouble getting a DVD burner. If you want to save movies, that might well be a better option for you.