Montreal, Toronto and DC- 3 wonderful cities in which to drive a large vehicle!
If you are going to be driving in the central areas- imagine driving a ryder truck...that's about the size of many C's
doable? if so- then get a C, you get a better cost per square foot.
be aware that a large vehicle may not be allowed in some areas of DC for security reasons- ( and any vehicle with propane may not be allowed in certain areas such as tunnels)
the advantage of a B is always: parking, ease of driving and MPG- the cost per square foot is high.
there are different interior configurations- we got the one that has 2 seats- there are 2 of us.
you'll do well to just look around and see what appeals to you.
Mike