Insanely Expensive....and Worth Every Penny

There are many threads which discuss things like "80% of the performance at 20% of the price", how overpriced certain components are compared to others, and how some components fail to hold their value on the used market.

So here is a cheerfully optimistic question:

What component, accessory, set of speakers, or tweak have you purchased - preferably new - that was wildly, insanely expensive, and in your honest opinion really WORTH IT?

Something that was delightful to own, and demonstrably superior to anything less expensive...

(I hope this is not a very short thread.)