I live in Nashville, Tn. Comp USA sells Mac's but I would have to pay sales tax. Buying direct from Apple charges tax, some of the on line dealers don't charge tax. Our sales tax is 9.25%. Also after reading some post where would I have the best chance of getting current production? I have read on this forum of people getting older production models from Apple direct. Any advice would be a great help. I will be getting a Mac Pro. Would I notice a difference between 2.66 and 3.0 on the processor? Should I buy the extended warranty from Apple?