I had to sell my nascent 1857 proof set. I had the trime, half dime, dime, quarter, and half dollar. I still think about those coins. I also sold my 1885 mint set. It obviously didn't have the trade dollar but I also never found a business strike of the nickel three cent.
I had a 1924 St. Gaudens $20. I actually made a profit on it, but I still wish I hadn't sold it. I could get another one, but the cost is much higher now then when I bought mine. It was $400 then.