Welcome crjr
You are right on about this being one of the best sites on the net!!. I am heating about the same square footage as you are, and thought about building one myself. I looked at lots of different stoves, both conventional and gassifiers, and I ended up with a Natures Comfort GT-220 gassifer. Basically what it boils down to is you have to have well seasoned wood (around 20% or less moisture) and you will burn far less wood than a conventional stove. As far as cleaning, I give mine a good cleaning about every 14-16 days. It takes me 30-40 minutes to do this. There is no way that I could cut enough wood in 30-40 minutes every 16 days to make up the difference I am saving in wood. And as a added bonus there is very little smoke= happy neighbors. The P&M optomizer is also a good design, check out Jackels homemade build on this site, he did a nice job of combining features from the natures comfort and portage & main gassifiers. Whatever you decide to build, keep us posted and remember, without pictures it never happened !!