I've got three in my collection currently.
Turbo - Sit-Down version
Spy Hunter - Stand-Up
Alien Vs. Predator
Every time I fire up AvP I keep expecting the board to be dead because of the short life span of the battery in the board. Only supposed to last 5 years or so but it's up to 10 and counting.
My wife won't let me get any more until we get a house. But after that.....