Save $480 and install it yourself: (buy 2!)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231124
Installation guide here:
http://docs.info.apple.com/article.html?artnum=303491
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231124
Installation guide here:
http://docs.info.apple.com/article.html?artnum=303491