I was thinking about upgrading my macbook's internal space, and found these two options 500GB for 120 or less. Are they both pretty much the same thing? One is seagate the other is western digital
http://eshop.macsales.com/item/Western Digital/WD5000BEVT/
http://eshop.macsales.com/item/Seagate/ST9500325AS/
http://eshop.macsales.com/item/Western Digital/WD5000BEVT/
http://eshop.macsales.com/item/Seagate/ST9500325AS/