It varies, but if you look at the special deals Dell offers for laptops, you might find a good one. You loose the customisability, but it appears you can save a large amount of money compared to their standard offering.
Edit: Expanding on Yalta's link, this site is great for checking out the performance of specific laptop components. Additionally, your $2000 budget far exceeds your usage requirements as you've described them. I'd reduce it to $300-$1000 at most.
Edit: Expanding on Yalta's link, this site is great for checking out the performance of specific laptop components. Additionally, your $2000 budget far exceeds your usage requirements as you've described them. I'd reduce it to $300-$1000 at most.