I'm considering an iMac as my first Apple computer. What specs would be best for my needs? I will be using the iMac for web browsing, streaming videos, Microsoft Office, and very very minor photo editing. I would like this Mac to last a long time and with my basic usage, I feel this is possible. What specs should I go with? I'm leaning towards the 27" model. Or should I wait for the newly released model in the Fall?