I went and shopped for a Dell XPS 17 model. Because I knew exactly what I wanted, I started with the base model and then customized it to my needs. The cost was around $2,100. Next, I started with an upgraded model which had extras that I didn't really care for. I customized it to match my needs but it still had things I didn't want. The cost, however, was only $1700.
How can this be I thought? A laptop with more features that costs less? So I went back to the base model and I customized it to match EXACTLY what I had customized on the upgraded model. The cost difference: $508.
Here are the two quotes: base model quote & upgraded model quote.
You can clearly see that the market value on the items are the exact same, $2,207.99. But the upgraded model has $528 in discounts while the base model has only $20 in discounts. Even in my cart, this is what is shown:
Bottom line: Be careful how you shop on Dell.com.