BETTER IDEA!
Send me the $5000 you were gonna send to Alienware, I'll build you a system with better performance specs and better aesthetics, pocket $750, and leave another $1000 tucked into a 3.5" bay for ya.
Although people around here would probably work for free to build something with that kind of a budget. So no pay for me
Better yet, spend a month or two reading up, then do it yourself. You'll save a duffel bag full of nonsequential $20 bills, learn some things, have a lot of fun, and end up with a beastly rig that you can both like AND take personal pride in.