First, to answer the ? in your other thread about a 2nd hdd. Are you all set with the OS or does it have to be included in the $500?
OK.
Patriot makes good memory and here's some free Gaming Series with an upgraded mb for the same $.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130644
Buy going with the Blue drive you already have, could get an ssd, like this one, its one of the better ones. And 128GB for C:/ - programs - and more, means you can usee the blue strickly for storage.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227791