I have a Vermont Castings Defiant II that has a catalytic converter in it and I want to try to convert it to coal.
Take the time to do some reading on this site and you will see that even some stove manufacturs are not able to design and build a stove that burns coal realy well. Learning to burn coal is definately worth the time and effort, which can be fun, but only if you have a stove that has a chance of giving you that long and efficient burn you want. Sell your stove, or do as I did with my stove and install it in the garage. By reading here, you will get an idea of stoves that are popular and don't give thier owners much grief.
Tell us more about your situation, i.e. chimney material and height, how long you would like your stove to heat without tending, square footage you need to heat etc., and we can at least give you suggestions for stoves that will most likely meet your needs.