We all know we pay a premium for Apple products - so traditionally I like to sell whatever I am using (iPod, laptop, displays), not long after I get a new version to get defray the cost of the upgrade. I've had a great advantage with this system since I've lived in big cities with an active craigslist community. However, after buying used and refurbished photography equipment for a while, maybe I should be the one looking for deals on new(ish) equipment. I'm a little squeamish about buying a used machine, especially since your evaluative time can be quite short ("here it is, check it out...so, do you want it?"). So, if you do this a lot, what do you look for? I've seen people do the following: 1. Check for bad pixels 2. Run an Apple Hardware test 3. I once stopped somebody with a screwdriver from inspecting my PowerBook's innards I'd be keeping my 500GB HDD, so that's not really a concern. Any thoughts/advice?