I bought a laptop for my wife earlier this year and I went with Dell because I have had good luck with their products from a reliability standpoint. One tip that I will give you is that Costco can usually give you a better deal on a Dell than Dell can!?!?!?
Figure that one out!
I got her laptop for about $150 less than Dell's best price--which to me makes absolutely no sense. Plus Costco has the 90 days return no questions asked policy, they extend the warranty from 1 year to two years at no cost and if you use your AMEX you wind up with a 3 year warranty.
The only item that is downgraded on the Costco box is the McAfee is 90 days whereas the Dell boxes come with a 15 month subscription. But price wise Costco is still the way to go.
My desktop is quite old (approx 10 years - - still running Windows 2000 Professional) so I recently called Dell again to give them another shot. I have a $275 gift certificate for Dell that I have been attempting to use but Costco beats Dell on their own box!
Costco carries HP and Gateway as well and I suspect that you would find the same thing on the pricing.
In the meantime, I am still looking for a way to use that Dell GC!
Tim