Thanks for every comments !
Mogens asked : "What are the qualities that disqualify the Mudan?"
I have to admit that I have some difficulties using the Mudan TLR. I always get confused with the knobs and sometimes I forget to advance the film! I find it diffcult to hold, where you put your hand under the Bronica for instance, which feels more natural. Might be weird, but I have some difficulties to stabilize the Mudan since its so light.
And quality was not around when the Mudan was engineered. Mine was bought by my father on a flee market in China. Lucky that its works... for now. But I will put a few films in it to check to which extend the TLR is (not) for me.
I'm not so sure about Isolette, Mamiya six and other similar cameras as they are getting old (what about the bellows in winter?). At the same time, I could get one to try (prices are so low) and sell it back even with a small loss in worst case.
In a way, the manipulation of the camera is also part of the photographic process. So trying a camera is important I guess.
The "other" Mamiya 6 is out of range for me (price), even if I'm sure that it's a wonderful camera. And yes, I dream Plaubel sometimes...
Somebody mentionned the Pentax 6x7. I always thought that such camera would be way out of price, but I was rather surprised to see they can be reasonably priced
(the sale of my Bronica would pay for a P67 I guess). The second generation is not too old, but definitly a boat anchor (5.2 pounds) !!! Big as a tank ?
I'm amazed by how prices when up in recent years. Who could tell that a Bronica could become an investment...
The P67 is definitly exploding my (initial) list of requirements... I'm starting to wonder : are price and weight just going in opposite direction ?
I could just sell my 150mm and get a 80mm for my Bronica. The Bronica is a bit more than 3 pounds. Probably not bigger than a Pentax6X7 (just not the same shape). I need to test more thoroughly my TLR. And maybe making some sort of table to match camera and requirements. That would help.
And 6X7 starts to look interesting... A kind of quirky square, just enough dissimetry to make it more dynamic than the square...
Food for thought...
ps.: looking at too many cameras is not a good idea... !