I have Spirecrest and Bellfaire and like them both but would never play with all together. Tried it once and it was a bit of a mess. If you just want to make the base game more asymmetrical, #Bellfaire is the way to go because of varying player powers. I really like #Spirecrest but I think it changes the game pretty significantly. I have detailed writeups on both and will post the links later today if you're interested.