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Reasons for not selecting the highest efficiency steam boiler?
Maybe yes, maybe no. Pay CAREFUL attention to Brad White's--the first to this thread--wonderful response. Get the ENTIRE system in top-notch shape (to possibly include re-sizing of the rads if possible/necessary) and if history holds at all true, fuel oil (where widely available) will remain the most cost effective fuel (on a BTU) basis with the Megasteam providing efficiency levels that hithertofore were considered unattainable via residential steam.
If you have any time at all, buy Dan Holohan's (owner of this site) regarding steam. Read, re-read, COMPARE to your existing system and read again. This will give you the ability to <I>rapidly</I> separate the good steam men from the hacks and wannabees.