Been thinking about this for a while, can't really decide yet. Since I got a new Pentax 6x7, my original Pentax 645 is seeing no action. I just have the camera with the standard 75/2.8, an extra 120 insert and a P67 to P645 lens adapter (and P67 55/4 and 105/2.4 lenses that I can adapt and use pretty much as native). So I've started to think about selling the P645. Actually, use it as a part trade for a different camera. Now the hard part, I'll try to be concise and clear: 1) As much as I love the P6x7, I can't ever forget its shutter is fully electronic and already 40 year old. I'm very afraid it will just die some day and so further investment on this system always takes this into account. Mechanical cameras look a better option for an additional one. 2) I like the 6x4.5 format but would ratter not be limited to that and have at least 6x6 option. I never load the P645 if I don't have a specif outing in mid because then I'm limited to the type of film loaded, lack of interchangeable backs is a strong downside for me. So I've started looking into the 50xCx Hasselblads. It is a stretch, but I do have budget for that. However I think I would always treat it like a precious object, not a camera to actually carry with me with little concerns. Bronica S2A was the next target. Heavy and difficult repairs are the main issues. Nikkor lenses look nice. Not as nice as the Zeiss available with the Hasselblads that I'd love to use, but I can live with that. In between I've looked into Kowa Super Six, Mamiyas (Pro TL mainly) where I could also adapt my 6x7 lenses but mechanical speed is very slow and only available on older models, Bronica ETRSi and SQ-A with a 1/500 mechanical speed that is probably the one I use the most but still limiting, etc, etc, but never arrived at a fulfilling solution. Any other thing I'm missing? Some guidance would be greatly appreciated!