Hi BMaverick,
I do have a 6 foot PTO tiller and it works just as you describe.  The desire for a bottom plow is due to living in good ole NC red clay.  Repeated rotary tilling of the soil can create a hard layer at the tilling depth.  I want to bust it and turn it over.  Also I have some soil amendments and winter cover crop I would prefer to flip and bury rather than chop.  I have thought about the single tine ripper sold by Tractor Supply to aid the tiller but would prefer a turning plow.