Cheapest price I've seen is 6100. I have a feeling this might be the last run they are doing. If that's the case better get 1 now. They will be 6500-7k in no time, especially if Metallica doesn't look as good.
If you had to choose between getting ac-dc or waiting. I would get ac-dc. If you like Metallica or Star Trek better you could prob move ac-dc without loosing money.
I just sent in the final payment for mine. Should arrive in Feb, can't wait!!