Thinking about buying a new mac pro and after doing some research a couple of questions keep popping up: 1. When are the Core i7 Intel Mac's expected in stores? IYO, would it be worth waiting for these? 2. When is Snow Leopard expected in stores? IYO, would it be worth waiting for it? 3. Is there any indication that Snow Leopard will be a free/minor update for Leopard users? Thank you!