WPT and Ripley's are both extremely deep. If you don't mind the theme of WPT, I think you'll find it's a great game with some innovative rules. Ripley's has good rules and (in my opinion anyway) one of the most memorable (if not actually the best) Stern sound packages. If you can find an Indy 500 for your price range, that's a great choice too. The game has quite a few interesting features with some unobtainium goals like cashing in a triple triple "A,200,000,000" victory lap.