I have a mid 2007, 1st generation aluminum iMac that has become so sluggish that I have concluded it is time to replace. This computer sits in our upstairs office and is not used on a daily basis, but does store our entire Aperture photo library of some 25,000 photos. (And don't worry, the photo library is backed up.) Our "primary" computer, which isn't used for anything particularly taxing (web browsing, email, word processing and very occasional non-pro photo/video editing) is a 2011 MacBook Pro. I'm looking for the most cost-effective option: --Replace the iMac upstairs with the MacBook Pro, then replace the MacBook Pro with an Air (or possibly even an iPad). --Replace the iMac with a Mini--if so, which one? --Replace the iMac with another iMac --Other options? I really don't want to spend a lot of money, since I'm paying college tuition for 2 kids, who of course have much nicer computers than I do , but I want a solution that I won't have to worry about for a couple or three years. Any advice?