I think its not a bad idea at all Mark, i can also see it spiralling into a huge project with unlimited posibilities leading from each question.

A flow chart for newbie wanting to buy for the first time could be very helpfull based as you said on what you want what your willing to spend and the willing to learn. Coaxials very easy to learn on ccpm machines take much much more studying etc. Some dont really understand the effort and repair cost which ultimatly leads to chopper getting stored or sold and the hobby being dropped instead of finding a more suitable machine for the person in mind. A flow chart to to steer the person in the right direction could be just the thing for some people.