Simplify your offer!
There are too many choiches on the Dell website. Take the laptops for example, there is the Inspiron (R and Z), the XPS, the Alienware, the Vostro, the Latitude and the Precision lines!
The same goes for desktops.
Make it simple to choose: keep focusing on good design and quality, but reduce the number of choices. Focus on quality, not quantity.