Amazon has a sale on a Dell XPS box with an i7-4790 CPU, 12Gb RAM, 1Tb HD, Nvidia GT740 graphics card, DVD burner, 6 USB 3.0 ports and media card reader for $638 (with free ship if you have Prime). Same unit sells for $900 at Dell.
http://www.amazon.com/o/ASIN/B00K0HMVNM?ie=UTF8&m=ATVPDKIKX0DER
http://www.amazon.com/o/ASIN/B00K0HMVNM?ie=UTF8&m=ATVPDKIKX0DER