I am planning to purchase a 13" Macbook Pro base model (first Mac by the way), and I want to upgrade from the stock 160Gb HDD. I don't really see myself needing 500Gb, but I have read that a higher density drive outperforms a lower density drive. Newegg currently has the 500 WD Scorpio Blue drive listed for $30 over the 320Gb edition. Will I see significant performance increase by going with the 500Gb model instead of the 320Gb one? What about power consumption? Is one better than the other? Thanks in advance.