Remember we say cheap, so we are going to create AMD&ATI config.
WARNING! By cheap we don’t mean low performance!!!
Lets start with the Motherboard..

Brand: Gigabyte

Model: GA-790XTA-UD4
CPU Socket : AM3
Supported CPU’s :  Phenom II / Athlon II / Sempron 100 Series
2 x PCI-E 2.0 x16 slot (x16 or x8, x8) supports ATI CrossFireX
8 Channel Audio from Realtek, 10/100/1000 mbps lan / 6xSata3 / 2xSata6
AMD 790X / DDR3 – 1333 | 1066 max 16GB ram.
This motherboard is supporting the latest AMD socket’s + you can always buy a second video card and enable CrossFireX! you won’t need new mobo for atleast 2-3 years i guess.

Price: ~$91.99 Newegg Link

Now the CPU…

Brand: AMD

Series: Athlon II X2 / Model: ADX260OCGMBOX
Socket: AM3
This is a 45nm Dual-Core Athlon running at 3.2GHz – works really nice with most of the new games, but later it can be OC’ed!  however Heatsink & Fan included are also included in the BOX!

For gaming, this looks way better than 2.5 Ghz quad core (5 more dollars). don’t ask me why.

Price: ~$71.99 Newegg Link
-

A time for Video Card and optional CrossFireX!!
Brand:  SAPPHIRE

Chipset Manufacturer : ATI
GPU : Radeon HD 5750 / 1GB / GDDR5 /128-bit /memclc 1150MHz (4.6Gbps)/ Core @ 700MHz
Supports DirectX 11 & CrossFireX / max resolution : 2560 x 1600

I’d say you can play almost all games to date with this, but if you get another running CrossFireX, you can play everything smoothly.

Price: $119.99 Newegg link

RAM – DDR3 Brand: G.SKILL / 1333 (PC3)

This thing is made for Gamers, works well with AMD.

Price: $75 Newegg link

Get a Case if you need: Newegg Link

Power Supply!
Brand:  CORSAIR!

Model: CMPSU-650TX
Type: ATX12V / EPS12V
Max Power: 650W
SLI/CrossFire ready / Ultra-quiet / One of the Best PSU’s ever made.
Price: $89^{.99 Newegg Link}
HDD Brand:  Western Digital / Series : VelociRaptor

Capacity: 300GB
Cache: 16MB ;  SATA3GB/s  ;  10,000 RPM  this is a fast HDD. i guess it does not include SATA cables.

Price : $179^.99 Get this HDD form Newegg

Total:

HDD(~$180)+PSU(~$90)+Video(~$119)+CPU(~$72)+MB(~$92) + case(~$30)+RAM($75) ===

~$675 USD.

p.s i’d spend $119 for 1 more Radeon HD 5750!