At the moment, my MacBook Pro has the original 320 GB 5400rpm HDD that it came with. It has gotten quite a bit of use and I have been thinking of upgrading, either to a 7200rpm HDD or to something like a 120GB SSD. The issue I have been experiencing is, I guess, pretty normal for a 3 year old 5400rpm hard drive that's had quite a bit of use. App loading is slower than I'd like as well is start-up. My old laptop, a Toshiba Satellite, experienced a very significant improvement from replacing the stock 5400rpm hard drive with a Crucial M4. I've been wondering if I would experience significantly lower startup and app launch times with a 7200rpm HDD over my 5400rpm or would I need to go to SSD? I'm looking for most app start-up times to be around the 2 second mark. At the moment, some larger apps like Logic and IBM SPSS Statistics are taking around 10-15 seconds.