If I could buy NIB it would be the olders ones. For whatever reason I enjoy the entire games of the Bally/Williams Medieval Madness, Twilight Zone or Attack from Mars. The calls outs, sayings, playfield layout in these games are just too good and make them extremely fun to play. I also prefer orginal themes much more which B/W did more of and I wish Stern would try. I know MM is the only orginal theme out of the three above but I feel like they all feel like orginal pins at times by the way there were designed.
My favorite Sterns are LOTR & SM for sure because of the game play but the three above I feel more attached to and would want to own first. As for AC/DC Pro I feel they really could have done more with the game layout which bores me compared to LOTR and SM. I thought this woudl have been a great NIB to buy but after playing it was not convinced and felt more reward in GNR game field layout.