The faster proc will help with Photo editing, but won't be noticable with email. If you are planning on keeping a machine for 5 years though, get the best you can afford, imo. The faster proc will help resale value as well. (personally though, I recommend grabbing a high-end refurbished machine, applecare, and then selling it 2.5 years. That way you can sell it w/ 6 months of applecare left and put the money towards a new machine, rinse & repeat).