Do you want an actual furnace unit to tie into the ductwork? That kind of limits the selection, Keystoker and Harman both make anthracite furnaces, but I think the Harman is a hand fed unit. Hitzer makes a hand-fed unit, at least one member here has one of them installed; you can read about his experience here: US Hot Blast Furnace 1557
Considering that your house is relatively small, you should be able to heat the basement and first floor pretty well with a stove. Is your basement ceiling insulated? If not, I would consider putting a stove in the basement and using your existing ductwork for cold air returns. I have a stove in my basement, and it keeps the basement and first floor nice and warm. Once you get used to warm floors you won't want anything else.
Edit: If you don't mind a hand fed unit, take a look at the Harman Mark series. http://www.harmanstoves.com/list.asp?id ... l%20Stoves
This link is broken, either the page no longer exists or there is some other issue like a typo.
These stoves will really throw the heat and are built really well.