I had problem in understanding that site,whatever I could understand was that there is huge amount of tax, and the components were overpriced. so i give you the build based on newegg.
Also you can save some money by getting Windows 7 Home Premium rather than the Ultimate one. You get almost all features except those that may be needed for big enterprise in networking,etc.
CPU: $220-
i5-2500k. Great Overclocking ablity. Easily reaches a minimum of 4.2Ghz.
You don't need hexcore processor for gaming.
Most games don't utilize those extra cores.
Motherboard : $145-
Gigabyte GA Z68X
Can run dual graphic at 8X/8X. Has USB 3 support,etc. Its cheap as well.
Case: It's your choice what kind of case you would like. Here's my choice
CoolerMaster HAF 922 ($100) If you choose any other case ensure it has good airflow and size good enough to accomodate 2 Video Cards.
Cooler : $30-
Xigmatek Gaia. It's cheap, performs similar to CoolerMaster Hyper 212 Cooler.
Here's a review of it. Go with CoolerMaster Hyper 212 if you find it cheap.
Power Supply: $110-
Corsair Enthusiast TX750. Sufficient for your gaming needs and overclocking. If you don't find this one try to get a power supply of atleast 750 Watts, that's atleast bronze certified from a reputable brand.
Graphic Card : $500-
2X HIS Radeon 6950 2GB
Here's an overview of
crossfire performance of 6950
RAM: $75-
Gskill Sniper 8GB(2X 4GB). Any other 8GB( 2X 4GB) combination running at 1.5 volts and CAS 8 , CAS 7 latency.
HDD : $60-
Seagate Barracuda 1TB
Cheaper as compared to Samsung SpinPoint 1TB. Go for Samsung Drive if you find it cheap.
Optical Drive : $19-
LiteOn
OS: $100-
Windows 7 Home Premium SP1
SSD : If you find yourself comfortable with the idea here's one
Crucial M4 64GB for $115.
Total : 1474 USD
Here's a thumbnail of all the following parts :
If you find that after taxes the components are out of your budget try downgrading some of them. Here are the options :
1. Drop SSD.
2. Drop to 4GB RAM
3. Drop the second HIS 6950 card.
This should free you some money.
When you drop the second card, you feel you have some money try get a GTX 570 or Radeon 6970.
Other option include changing the motherboard. But make sure it has all the necessary features that you may need including Crossfire Support(8X/8X) atleast.