I have a Dell XPS M1210 loaded and I LOVE it. I've had it about 3 yrs, it has never given me a problem. It is very lightweight, small screen and I can't say enough good about it.
My husband and daughter have Dell Latitudes and Love them.
We got the larger Latitude for daughter because we felt like it would be a little more sturdy for a teen. We've had no problems with any of them. My Dell and daughter's Dell are both Vista programs and no issues with that either.
We bought all the Dell laptops through the Dell website.
Before my Dell, I had an HP Pavillion which was also very good. I did have some battery issues with it but Best Buy was great for customer service. We bought it there with the warranty.
Good luck!