ST is hard to find? Maybe locally but seems like a lot come up for sale on pinside. I would say get AS now since it is new and get a used ST pro later when you can find one. I wouldn't be comfortable paying the same for ST as AS. ST is a much older game and doesn't have the color display. ST is a great game and I agree with all the comments above. I have not played AS but seems like a fun game. I know a lot of pins borrow things from other pins but AS seems pretty obvious about it right down to Sparky/Jackie. Guys that have played almost all say it is fun so that is really what is important. Can't go wrong with either but I would say AS to get a newer game with improved features.