i might add, krauter tends to resist servicing screw mount leicas, she prefers to concentrate on Ms.
Your mention of willingness to buy lenses with a slight haze or a few scratches is being way to pessimistic -- there is a lot of really good old glass out there, don't settle for less than excellent. Some of that haze can be very old lens cement (which was tree sap, really) that has gone bad, or etching from oil outgassing. Older Canon lenses are also really very good.
you will also read a lot of discussion about trimming the leader using a special tool -- don't waste your money or time, just hack off about 3 inches on one side so it looks a lot like the picture on the bottom of the camera's inside and you're good -- precision is not critical, all it has to do is get past the pressure plate...