Ok here goes....
HDD: http://www.newegg.com/Product/Product.aspx?Item=N82E16822148697
SPEAKERS: http://www.newegg.com/Product/Product.aspx?Item=N82E16836116048
CASE: http://www.newegg.com/Product/Product.aspx?Item=N82E16811147153
MOBO...
Th 1GB will give a bit more performance, like if yer playing newer games with the 768, youl have to turn off AA...but it depends on the price difference. If the 768 is way cheaper than the 1GB, go with it. Itll serve you well.. :)