Was thrilled to see the much larger hard drive sizes on the new MacBook Pro Core 2 Duos, *until* I saw that the speeds are only 4200 or 5400rpm. What is up with that? I bought a new MacBook Pro in May and upgrading to the 7200rpm drive was a must-have for me. Why would Apple put such slow drives in these so-called "pro" machines? Is anyone else at a loss to explain this?