I'd recommend the 6000 with a CeleronM processor. It starts at $700 right now, has a 15.4" screen, Intel GMA900 graphics, 4 USB ports, solid design. I love mine. I would say go with a Celeron simply because you don't plan on it for major useage. The CeleronM is actually quite zippy, and if you're daring enough, you can pinmod the Celeron 1.3 to run at 1.733. Should have no problems running at that speed. Add a 1GB stick of RAM from newegg for $100, and add some other options you may want, like a DVD burner, or the WSXGA screen (highly recommended), bluetooth or an extra power adapter (also highly recommended for how cheap it is), and you can get a great laptop that still has enough power to play a few older games (say, anything right up to Doom3), and provides just an overall wonderful laptop experience.
For even cheaper, you can get the 1200, which starts at $499 on Dell's site. You get a CeleronM 1.4, but a 14" screen stuck at 1024x768 and the Intel Exreme Graphics 2 chipset. I'd get this one only if you were planning on doing no 3d graphics on it at all.
For a first-time laptop buyer, you should pick up just about the cheapest thing you can. You never know how you will use it. I've known people who go out and spend 1500-2000 on a new notebook and hardly ever use it. I know people who picked up something used for $300 bucks and never even touch their desktop. That's what I did. I got a cheap HP laptop that was beat up, and I started using it more and more until I just gave my desktop away to some friends who had an old gateway. I never used it anymore. Then, when I bought my 6000, I took my time and used the experience from having my HP to decide what I wanted and settled on something. Even now though, I wish I had bought a 9300. It's not much bigger, and the 6800 would have been a nice comprimise.
You'll never be happy with anything you pick, but its all about whats most important to you. For me, having something light, portable, but still having some graphical muscle under the hood was what was most important. The truth is the 9300 would just be too big and too heavy. Sometimes a couple of extra inches + 1 pound make or break a deal. The 6000 is what I considered to be the high-end of still being portable, thats why I picked it.