Check out the Yahoo group Practiceimprovement1.  There are a bunch of folks on there discussing the Ideal Medical Practice.  Many are cash only practices and I think you could get some good advice.
I have been in practice 23 years, 13 solo.  If I had to do it over again I would not take insurance.  I am finding a trend here where the BIG TWO insurances (Humana, Anthem) are now paying less than Medicare.  As a solo physician, they are not very anxious to negotiate with me.
Leslie