$1499 buys you a lot of system:
Intel Core i7 2600K 3.40GHz (Unlocked CPU for Extreme Overclocking) (Quad Core)
ASUS P8P67 Pro (Intel P67 Chipset) (Features USB 3.0 and SATA 6Gb/s)
8GB DDR3 1600MHz Corsair XMS3 Series (High-Performance)
750W Corsair TX (Dual SLI Compatible)
1x (1TB Hitachi/Seagate (7200 RPM) (32MB Cache)
DVD-R/RW/CD-R/RW (DVD Writer 24x / CD-Writer 48x)
1x NVIDIA GeForce GTX 560 1GB (Includes PhysX Technology) (Overclocked Edition)
Corsair H60 Liquid CPU Cooler (High-Performance Edition)
Stage 2: Overclock CPU 4.5GHz to 4.8GHz (Requires Pro or Deluxe Series Motherboard)
Microsoft Windows 7 Home Premium (64-Bit Edition)
To the OP I recommend you do not try overclocking especially if you are always short of cash. Overclocked items have a tendency to die at unfortunate times.
As for the guys price of $1499. Something aint right, the CPU alone is a 1/3 that price.
Anyways, probably you want to look at this
Quad core CPU @ 3.0 Ghz per core. Intel CPU's will cost you more.
A motherboard for your CPU. Make sure it is the same socket type.
You don't need 8GB Ram if you don't want something extravagant, 4GB will do fine. But make sure its branded ram and also make sure it is a Speed that is acceptable by the motherboard without overclocking the motherboard for faster speeds.
Buy a 60 or 80GB SSD (Solid State Drive) for your Windows installation and subsequent program files.
Get a separate SATA II HDD with whatever amount you feel is best, 500GB upwards. Use this for installing your games.
At least a Geforce 460 1GB GPU.
If you can find one reasonably prices get a BD-ROM/RW drive that can burn Blu-ray discs, it may come in handy later for big backups. Plus the drive also reads other media types.
I am guessing you will need a monitor also, unless your TV if you have one has a HDMI slot then you can use your PC on it through that slot to get either 1080i/p or the max resolution your TV allows.
Alienware is part of your built PC? Alienware is part of pre-built PC and it means you don't build on your own, except for upgrades unless you got other PC desktop.
I prefer to build a PC that I order the parts and case from newegg and they are super cheap. You can build a decent PC desktop for $1,000.