I watched some videos on the differences between the two. I just don't know which one to go for. It's a small difference in price.
Cosmos
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119138
Cosmos S
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119150
Cosmos
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119138
Cosmos S
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119150