They are pretty consistent about jumps per $. I think you are wondering if there is a special spot. No… only if you can afford to match the very best to your room.
Each double in price is a real jaw dropper.
So in my large room Olympica -> Amati -> Lilium are all huge jumps. The Serifino would sound right if I had a much smaller room.
Yes, thinking about this, any 2x jump is going to be really impressive and if more, even better.