Just my opinions..I agree with the 50-80-150. I've just bought a mint 503CW with 80 and 50 (saving now for a longer lens). It all fits in a nice little Kata rucksack. Went out at the weekend in very hot weather to shoot with it. I just loved the time out with it. Beautiful to look at, and use. Superbly engineered. And the square format is fantastic! The negs (Delta 100 in Rodinal), are sparkling! You cannot fail to be impressed with a Hassy. Personally I've used and could not get on with the Mamiya 7 rangefinder, although it's a great camera.
I will however 'forget' the 180 mm.
Somehow not my thing. Not long enough, not short enough.
And the 135 mm. Too dark, bellows-bound (despite the much too expensive varible tube that what available at one time), adding nothing, except a very nice focal length, to the set.
And the 105 mm. Nobody but NASA could afford to buy that lens. So no choice but to forget about it.
The 50 - 80 - 150 mm kit is the standard set for many photographers. And you can really tackle almost anything with that set. All first class quality too.