Congrads on the new place! I'd agree with insulation and sealing for air tightness as first priority. Install programmable thermostats on all of your rooms. When I was on electric heat I used to set back the temperature in my spare rooms - they then acted as kind of extra insulation. I'd also suggest installing a high efficency stove right away if you don't have one. The savings this winter would offset the cost considerably - and as cool as those RMH stoves are, I doubt they'd be popular with your insurers, building department, or future real estate agents!