I am looking at both of these for a crossfire 4850 setup and an overclocked Q6600.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131317
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131219
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131317
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131219