Thank you all for your valuable advice. I finally made up my mind about a month ago. I was indecisive and decided to go see a few watches - Lange Moonphase (Platinum), Chopard Lune One (perpetual calendar), IWC ref 5022 and the FP Journe Octa Lune. I followed many of your advice and the Octa "spoke" to me. It moved me versus the other watches that I simply 'would like to have' but they didn't move me like the Octa Lune did.
One month down the road, I am still enjoying the watch but the date and moonphase stopped advancing all of a sudden. Yes, I've read the manual and tried changing the date outside of the midnight vicinity but still no luck. Looks like the watch will go back to the boutique as soon as I get back to Hong Kong next week....