I would also recommend a Bessa, especially since you said you felt a bit lost when the meter in your Konica went out. They can be had brand new for the cost of a 30 to 50 year old Leica, they have a meter, they can use all of the same lenses, and you can choose your model based on the shooting you do, i.e. more wide angle, more normal, or more tele. You also have the choice of a fully manual version or an aperture priority/fully manual version. Any used Leica is a bit of an unknown quantity- sometimes examples that look fantastic on the outside have serious internal issues, and sometimes leicas that look like they have been run over by a truck work flawlessly. With a brand new bessa, you know it will work, and if it doesn't for some reason, it has a warranty. Also, since you do portraiture and some photojournalism work, you might find yourself in a position where you need or want to use a flash, and the bessas have a 1/125 sync speed compared to the leica's 1/50th sync speed. Also, since you are in Asia, you can probably have one shipped to you from HK or tokyo (or europe, depending on your location in asia) cheaper than you could have something shipped from the states.
As to your favorite wedding photographer using an M6, the question you should be asking yourself is which lens and which film he or she uses- that will make a much bigger difference.