I think you should start by listing a complete inventory.
Sure there are a ton of people here interested in pentax stuff. Self included.
You may also get some interest in the MF stuff, BUT, many people here are pentaxians first and always, and the other brands may not get the best attention here. You may also consider E-Bay or other camera forums./
Also, and everyone here may kill me for suggesting this, go out and get a Pentax DSLR and actually use the pentax gear
You could do a lot worse. You may also wish to consider nikon DSLRs but be sure to get one that will meter fully with the lenses, not just trip the shutter.
Look at both, and decide which you want and keep one system or the other.