NC,
In your research, may I suggest you consider a gasifier?  I am in Michigan and have only used 6 or 7 cords since October 2010.  Does it get that cold for long stretches in NC?  I have an old farm house with no insulation and we keep it uncomfortably warm all winter.  I mean no disrespect in any form.  Yes, it does cause some inconvenience, but I think in the long run you will be happy with your selection of burner.  I understand your worry of the up front cost, I still can't believe I coughed up that much money. It may well take longer to pay for itself in the South than in colder climates.  I do know I like the heat from wood more.  We ran out of dry wood and went back to propane, 73 on wood sure feels warmer than 73 on propane.  I can't explain it.  Should be the same, like a ton of cotton and 2000 pounds of gold. I'm outta shape so the extra work is good for me, the wood warms me 5 or six times where paying the gas company just boils my blood until the check clears.  A friend of mine was paying $1600 per MONTH for gas 2 years ago.  My wood cost about $150 for all season, but we cut it ourselves.  
Again,  not picking a fight or disrespecting anyone.  My version of no regrets whatsoever.  I plan on heating water and drying clothes with mine next season, making it pay for itself even quicker.