You can normally piece together better-performing systems if you buy your components separately & discerningly. Having said that, a good way to get started in the PC building scene is to buy a DIY (Do It Yourself) combo kit (often called a "barebones" system).
Another option that I just exercised for a friend: buy a Dell/eMachines/Compaq/whatever system on eBay. My friend is in Atlanta, GA. I just bought a suitable machine & had my friend pick it up, in order to save on shipping fees. An AMD x2, x3, x4, x6 or Intel i3, i5, i7 system with a PCI-Express x16 slot available is all you need.
I have decided to sell my gaming computer as a whole. Not looking to part it out. The build is:
AMD Phenom II X4 830 Quad Core CPU
Asus M4A88TD-V EVO USB3.0 Motherboard
2x500GB WD500AAKX 6.0GB/s Sata HDDs
SilverStone SST-ST40F-ES 400 Watt Power Supply
ASUS PC-N13 Wireless Network Adapter
Sapphire Vapor X HD 5750
ASUS SATA DVD/CD Burner
4x2GB DDR3 1333 A-DATA RAM *all four slots used*
Lian Li Black Mid Tower ATX Case. All Black with Blue LED 80mm Fan in front
I dont remember the model number of the case.
The machine comes with Windows 7 Pro 64 bit installed.
If interested I can sell a logitech K120 Keyboard, G500 Gaming Mouse, and 20" ASUS VE208 monitor. I will not sell the monitor and mouse without selling the computer first as I will need them if the computer isn't sold. You can look me up on ebay. My ebay account is caraudioguy_1. I will gladly email any pics or answer any questions you have. My email address is email@example.com.
$420 plus shipping for everything including monitor keyboard and mouse, or $320 + shipping for just the PC.