I'm planning on buying a new iMac in the next few days. Do the retail Apple stores only sell the stock configurations, or can they make modifications to those? I want to get the 24" 3.06 with the only modifications being a wireless mouse, extended keyboard, iWork family pack and Apple care. Making any of the first 3 changes on the website changes the shipping time from 24 hrs to 1-3 days. I would think all of these would be easy to do at the store, but I don't really want to head to the store to find out that if I want to buy it there I need to get the basic package without any changes. Thanks for the help.