I would second the statement on Bally's Aladdin's Castle. I had never played it, my buddy had fond memories of the title and I found him one.
It is a great two player pin that I really enjoy playing.
Of the EM pins I have owned, they are almost exclusively Gottlieb and while I love them I have rally started to appreciate the later Bally pins. The bonus count down and extra ball function on the Bally EM pins have really spoken to me.
For some reason I really don't like roll over switches that are in the middle of the playfield, they don't feel like a target I am aiming at, so that has made me dislike many Williams pins that seem to always have many of these switches.