I thought I'd give this thread a bit of a bump because I was interested to see if others had common themes through their collections. I personally love a good space/alien  or supernatural theme but that's not my only consideration. I'm also drawn to many of the early 80's Bally games and I really enjoy the System 1 Gtb machines I've played too. So for me a my ideal collection would be a combination of the above with a few DMD machines thrown in for good measure.