I currently have 11 machines, a mix of older and newer machines. My goal is a total of 15 in my collection, which 4 should I add to round off my collection nicely? To me, 2 of the must have's are Monster Bash and Attack From Mars, I also placed Metallica and AC/DC on my wish list....but I'm not sure about both Metallica and AC/DC. Also what about Indiana Jones? Thoughts?