I took a look at that change-out program.
http://images.masscec.com/uploads/programdocs/Commonwealth Woodstove Change-Out Program Overview and Application Updated 3-4-14.pdf
Did you apply to substitute the Quadrafire or the Fisher downstairs? It looks like the installer needs to sign off on the install which includes making the replaced
non-EPA stove inoperable. To my knowledge, the 3100 is an EPA-stove and would not qualify for the voucher. According to the document, the new stove needs to be at least 75% efficient and have particulate emission of less than 3.5 g/hr for non-cat or 2.0 g/hr for a cat stove. Unfortunately, the Enviro 1700 stoves have higher emissions. There are not many large stoves out there that fulfill those requirements and cost about $2000. The Woodstock Ideal Steel would be a great option right now if you can find someone to install it. The Osburn 2400 also seems to fit the specs. I am not sure if the Englander NC-30 has been tested for efficiency but the emissions and price would work. You could also check out the Jotul F55 although the price may exceed your budget (but Jotul has a coupon on their website until the end of May).
Regarding the wood: Did you dry it yourself or did you go with the "seasoned" description of the wood seller? Be aware that most firewood dealers don't have the time and space to stack the wood up for one to two years to get it below 20% internal moisture content. If you buy your wood, I would get it now and stack it in a sunny and windy location in your yard. Put some lumber or pallets under it and some tarp or old metal roofing on top to protect it from rain (but leave the sides open). If it is mixed hardwood it will probably not be seasoned until the coming winter but should be good the winter after.