Hi, I am getting a mac and am confused on what I should get. I think I've worked out that I would probably need/want an iMac but, not sure whether to spend my money on a new or older one. I will be using it mainly for photo editing and surfing the web. Maybe the occasional game as well. So is it necessary to buy a new one? Or would an older version have the sufficient software and hardware to complete my needs at a reasonable speed? Please reply! Thanks a lot.