Best Coins in your Collections

Hello. I recently became a coin collector (numismatist if you’re fancy) and since it seems to be very difficult to meet others interested in the hobby, I was hoping to begin a discussion here. What is everyone’s favourite coin in their collection? What is each of your dream coins to find? Lastly, I was hoping for suggestions on the best antiques fairs around London for coins or best, most expansive coin shops. Thank you.