Ok, I am on a hard drive buying spree. Another thing I am looking to buy is external FW 800 2.5 enclosure (probably OWC on the go) and 500 GB hard drive. There are 2 options for that- 5400 rpm and 7200 rpm. In my macbook pro there is fujitsu 5400 HD. Is it worth to buy 7200 external then? In a future I am planning to upgrade my internal HD too.