I like Keystokers too, but I would also check out good used boilers. There is a Losch for sale is Scranton;http://scranton.craigslist.org/app/4351403106.html
$1250, it's been for sale for a while and it is the end of the season. They may take an offer.
With a stoker like the Losch you are not restricted to burning rice coal. You can burn barley, rice and buckwheat. Barley coal is the cheapest anthracite there is. There is no photo in the add, but it looks like this one.
Since spring is next week, I am assuming you are thinking of doing this for next heating season. If so, take your time and find something that fits your needs at a reasonable price.