I recommend that you check out Dell's Outlet Store . They have three types of computers there.

Certified Refurbished
Fully refurbished, visually inspected or retested, and repackaged to meet original factory specifications

Previously Ordered New
Never used, cancelled orders, or returned systems that were never fully booted. Systems tested by Dell Outlet.

Scratch & Dent
Systems with cosmetic blemishes that do not impact performance. Includes standard limited warranty.

The Previously Ordered New systems are generally in the area of 25% off and you don't have to worry about someone already using that computer. There are some fabulous systems available there depending on when you check for inventory as they sell as fast as they arrive.