I totally forgot about this until late last night @annephilbrick but there are actually some really good thermoelectric generators for wood stoves. They have a variety of products but I would recommend steering clear of the water cooled ones for simplicity's sake.

Probably the best one for your setup is this one: http://www.devilwatt.com/products/21-devil-watt-45-watt-wood-burning-stove-thermoelectric-generator-dw-sm-45w

You can view all their products here: http://www.devilwatt.com/products?limitstart=0