I would like to purchase an iMac asap to replace my aging Mac Mini. I assume it'd be better to wait until Lion comes out, so it ships with the new operating system? Also, I've never upgraded from one Mac to another before. In order to use migration assistant, would it pose any difficulties if the source computer has Snow Leopard and the target computer has Lion? If the answer to this question is 'Yes,' then I suppose that would be an incentive to buy the iMac today (with Snow Leopard) vs. 2 weeks from today.