For me at $8k+ the game needs to be the compete package including theme. The themes of JJP are tough for me to swallow for that price, even if I kinda like the gameplay.
Now Sterns, if I am not into the theme, I can go buy and try out at almost half the cost and be safe if game play is not for me. I bought IMDN and MET and wasn't into those bands but they are truly great pins. I paid 5K each or less on those titles. Unfortunately I cant do that with JJP games. BUT Wonka, GNR and TS, if they were available, would be the top three JJP themes for me, so we will see what happens.
I have never owned a JJP but am also warming up on WOZ a lot lately and would like to own one in the future. WOZ just seems like a good place to start with, in the beginning at JJP's roots. WOZ is my fav of the JJP theme group so far also.
I also think sometimes getting that first game from a company may open yourself up to other titles from them even though theme might not be your cup of tea. I bought a CGC AFM and was really blown away. I would totally get a MB now also.
Let yourself be open to change in what you like currently in pinball. It is more fun and interesting. No need to pick sides and dig in.