Decent insert (Quadrafire, napoleon, lopi, appalachian...) ?

I'm looking to put in a wood burning insert to reduce electric costs (2300sqft home in Southern Maryland, heat pump is very inefficient when temperatures drop below freezing). House has a standard fireplace 34" wide by 27" tall.
There are a lot of inserts out there, from what I've heard Quadrafire and Napoleon are the Cadillacs of wood burning world. Is the higher price justified ? Are there equivalent quality alternatives?

Thank you,

Boris.

@Boom Stick:
Could you give me a hint on what kind of variables. There are a lot of choices and I'm trying to find a more or less scientific way of coming up with the decision. What should I be looking for besides BTU, price & looks?

@kattpound
The fireplace is not centrally located but I'm not trying to run the house 100% on wood. The fireplace will be used during colder days to help the heatpump.