IQ and resolution is one criteria I'm considering when thinking MF/LF.
Initially, landscapes -- maybe architecture. The Chamonix (sans lens) is a very lightweight camera . As someone pointed out, even lighter than a MF camera. But I'm hesitant to get into used glass. Buying a used body (35mm, MF or LF) is one thing, glass that's a totally different subject.
Buying used glass should not be any different. Just stick to reliable sources that allow returns if you are not happy - KEH, B&H, ...
Besides, nothing beats a good piece of glass!
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.
If you don't mind the weight, consider RZ. The bodies are dirt cheap, accessories, lenses, everything. You can get a very good set with a few hundred euros/dollars. 6x7 film has a lot bigger area than 6x6 and personally I don't like the square format that much :-)
the mamiya RZ/RB's are absolute tanks. bigger and heavier than the bronnies. Both will give you excellent results. I'd side with the RZ/RB because I like the format of 6x7 alot better than 6x6 (what do you get with 6x6 if you want a rectangular frame? 6x4.5
As far as value for money goes the RB67's are pretty hard to beat if you don't mind putting your back out trying to handhold the damn thing and having to use an external meter. I picked one up not long ago and I'm extremely impressed at the quality of the lenses (even a single coated BGN lens from B&H), nice sharp and contrasty. You can pick up a kit for ridiculous prices on ebay or KEH (~$300 US or so) and there are heaps of them out there so easy to get repaired and find parts & accessories for.
I also recommend getting a prism finder if you're short like me.