I have an A1226 15" MacBook pro with 2GB of RAM and 120GB hard drive. I'm busting at the seams! It's running very slow, with 110GB of hard drive used up. I need more hard drive for photos, etc. and more memory for speed. I'd rather not spend the money for an iMac, so I'm considering upgrading this MacBook Pro with 500GB hard drive and 2GB more RAM (total 4GB). Can anyone tell me the pros and cons? Am I fooling myself to think this is going to come close in performance to a new iMac with 4GB RAM and 500GB hard drive? Thanks.