Honestly, while we're on the subject of Who Dunnit, I think that game is awesome, too. It was my first machine and I wish I had it, still. Turn off tournament mode, so that the roulette is totally random, and that really makes placing bets a tough decision. Not super deep, but the game is always different every time you play it. Awesome sound and great looking playfield.
I currently only own a JM, and that game is actually really awesome. However, if it's your first, you may want to stay away. There's a lot of things you need to do to it to make it play perfectly. If you have one that plays perfect, it's a great experience. If you have one with a crappy spinner and broken hand, the fun goes down the toilet. Sadly, you need to know a bit about pins to fix these issues. If you found one perfect, that's another nice one to start with.
But, try to get at least 2 or 3. That way, you'll enjoy them a lot more.
Finally, if you actually can find a NICE Shadow for only 1500. Buy it and run. Don't look back and run... Awesome game.