i have wanted one since they came out earlier this year, and apart from a missed opportunity of getting one from best buy for £420, they have been £500 throughout the year (apart from as you say £450 at John Lewis for the past week or so).
i grabbed one for £398, and can't wait to have it.
only thing is though, as it's an xmas present, i am not allowed it until xmas day. what are apple like with returning faulty units etc, as i have read a few things about the red light of death?
i know you get 14 days to return it for a refund etc after delivery, but xmas day will fall after this period.