I'm looking to get more internal storage on my MBP 7,1 I think I'm goig to go with HDD so I can get more storage for the $$. Do I need to get a specific GB/s? The one I'm looking at is 3GB/s http://www.amazon.com/Western-Digit...2299060&sr=8-1&keywords=5400+rpm+internal+mac What about the cache? 8MB looks most common? Any advice would be great! Also, is it pretty simple to do? I'm fairly technically literate. Thanks!