Say you have bought from an Apple Store a 20" iMac with no defects, not even a stuck pixel. Over time, you begin to have a little remorse over not spending the extra $300 for the 24" model. One contributing factor to your remorse is the criticism on forums like this of the 20 inch display. I've read the policy on returns and refunds (10% restocking fee, get certificate on line, have it shipped in). Can you do this instead at the Apple Store where you bought it? What do you have to do to arrange it? Anyone been able to get a waiver of the restock fee?