Hello again,, I really like stokers,, but they are not silent,, there are fans running,, if your home is silent, then a fan running may be annoying at first.
Take a look at the smaller boilers.. The Keystoker Kaa2, the Harman VF3000. And don't forget that with a boiler you can [will] plumb it into your Domestic Hot water,, so you will have unlimited hot water, and eliminate that cost along with your oil bill.. so even though the boiler costs more to start, it pays back faster,, and won't use up any of your limited floor space..
Keep an eye on your local papers,, Ebay, http://papershop.com/
for used boilers, stoves and stokers.
I'd look for used boilers from your local heating contractors too.. they often remove and SCRAP perfectly good coal boilers when installing new oil and gas units.. there are a lot of new units installed because the home owners no longer can [because of age] or want to tend a coal burner.. I'd literally go knock on doors, explain that you are in the market for a used coal boiler,, and offer to help or to remove any that they plan on replacing,, this has worked for several forum members..
I found my Axeman Anderson 260 on Ebay, in central Pa !!, and with the generous help of several forum members got it removed, and I brought it home to Michigan and rebuilt it... so there are options.
Hope this helps. Greg L