I've got a 2007 MBP (2.4GHz, 2GB RAM), with a nice 17" 1920x1200 matte screen, which I'd like to upgrade to be able to some photo editing. Currently (still) on 10.6.8. Q1: Although officially only supporting max 4GB RAM, should I go for 6GB instead? Q2: Would upgrading HD to SSD make a lot of difference when working with the smallish (max 14MB) RAW files from my camera (Olympus Stylus 1)? Q3: Should I upgrade to Mountain Lion (or later) if I'd prefer to use Pixelmator (which needs OS X to support the RAW files, in my case minimum ML) instead of Gimp (which is fine with SL)? Any advice much appreciated!