Buy an SSD, if possible. You will see a huge performance increase. I bought one for my 6 year old MBP and it feels like brand new.
Hmm, this is a great idea. At the very least I could get small SSD with enough space for my OS and store files on my regular drive. With your laptop being a Mac, and Apple really not enjoying people modding their devices, is there anything special you had to do to get your laptop to detect the SSD? Is there a specific one made for apple products? I've really only tinkered with Desktop PCs before.