From those two I would say Hearth just because it's going to give you an extra 20k over the Econo. It's always better to have more then you need with a stove, then to want more then you stove can give you.
Well I'm ordering the stove tomorrow morning and maybe I'll have it by oct. It will definetly be worth the wait considering the prices for propane heating in upstate n.y. The last price I heard was $4.09 gallon.