Are you comfortable building one? That way you can plan for upgrade capability. Usually, you want to avoid branded systems; particularly in Dell's case. They modify things so industry standard components won't work. Back in the P4 era, Mikey had the wiring on the Dell desktop power supply altered. The result being if you swapped out a failed PS with a white box unit, you fried the motherboard. If you build and stay with industry standard, you can get replacement parts just about anywhere. With the branded units you almost always have to send it back to the manufacturer or one of their repair centers and pay the shipping and danegeld they demand. Which usually winds up being far more than the thing is worth.