I do not see a very difficult choice here. If you are accustomed with distance focusing and whatever rule of reading the light, then a Minox A (meaning the otherwise known IIIs) is for you. Electronic-less, fully mechanical camera. Capability of shooting old cassettes 50 exp, Complan lens, in both metric or imperial markings, two filters additional to the fixed UV one on camera.
If buying a Minox B, expect the meter to be off by some 1, 2 or even 3 stops. It is basically a Minox A/IIIs camera, with a Gossen selenium in. They do fail, but with care and looking in reputable shops, these can be found in working condition (the meters I mean). Out of the models of B (honeycomb and lattice meters), I would choose the first one, they reportedly are better. Again, I would choose a Complan model, not a Minox lens for it.
If you'd like the camera to guess the exposure for you, get a C (btw, they all take either the
battery adapter or 5.6v batts, there is no Minox C that takes "one cell battery", al are the same re power source).
If you need a point and shoot Minox, choose the smallest one made, the EC. Pretty much an automatic Minox in the true sense. Make sure they are still have the ND filter in front of the sensor, because they are known to fall of.
The BL is somewhat overrated, and difficult to find with the meter working. Otherwise a perfectly good mechanical camera, as the battery (a MR44 adapter actually, or a hearing aid battery) only powers the (not coupled) meter.
The LX would give you automatic exposure and ND filter, which may come in handy at times. However, it does not use the same accessories the other older ones do (meaning the LX needs a different type of tripod head, etc).
Regarding the other models: TLX, CLX, AX and the like...I do have them and very rarely used. This is because I have never noticed any difference in the quality of the photographs taken with these, versus the other models.
More on Minox cameras and whatnot, here:
http://www.juliantanase.com
I hope you'll find what you are looking for, and have fun !