An HP laptop with Core2Duo And three Custom built Desktop beasts 1) My Gaming Rig: Intel Core i5, 16 GB RAM (4x4, with 8 GB as RAM drive for Virtual memory), Geforce 460GTX, 120 GB SSD, 4 TB Sata drives (2X2) Razor Mamba mouse, 32 inch Sony Bravia LCD full HD over HDMI, Logitech wireless keyboard, CoolerMaster 750 Watt PSU and Chassis 2) Primary work station: AMD phenom II x6, Radeon 5750, 4 TB sata drives (2X2 in RAID 1), 8 GB DDR3, 24 inch LG LCD x2, Logitech wireless Kit, CoolerMaster PSU 450 Watt and Chassis. 3) Secondary workstation: Intel Core2Quad, Geforce 9800 GT, 2 TB sata drive (1X2 in RAID 1), 4 GB DDR2, 21 inch LG LCD, Logitech wireless kit, CoolerMaster PSU 450 Watt and Chassis.
I'm using a Dell Notebook right now. It works fine for watching movies and doing you're basic social online stuff.
Alienware is a waste of money, you can build 4x more powerful system @ same amount. Only noobs buy alienware.