^ That is a good build...but few suggestions...
1. Mobo - You can check out this one too -
ASRock X58 Extreme...
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157163

2. RAM - A cheaper one but by no means a lower quality one -
Crucial 6GB - Don't be fooled by the given speed and timings...It can easily be overclock to 1600MHz with CAS 8...Check its reviews in newegg and here at TOMS...
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148247

3. Definitely the PSU - You wont need 1000W IMO...
For HD 5870 crossfire, this 850W would do just fine...And actually will be better than that 1000W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151083

If you want a modular one -
http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=2010090058%201297819680%20113142559&bop=And&ShowDeactivatedMark=False&ActiveSearchResult=True&CompareItemList=N82E16817371009%2CN82E16817151067

Thermal grease - These unlike AS 5 need no curring time and are electrically non-conductive...
http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=2010110085%204024&CompareItemList=N82E16835154003%2CN82E16835186020%2CN82E16835608008&page=2&bop=And&ActiveSearchResult=True
http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=2010110085%204024&CompareItemList=N82E16835154003%2CN82E16835186020%2CN82E16835608008&page=2&bop=And&ActiveSearchResult=True

CASE - For that price, might as well check out this case too...
CM Stacker -
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119122

Graphics card -
ASUS 5870 - Cheaper + Free shipping + 3 years warranty...
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121346
 

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