To adress many points in the previous posts:

-- The RJ85s are quite comfy planes. The seats are pretty much the widest in coach of any aircraft.

-- It is possible to squeeze 6 across seating into these things. I imagine this would be a bit tight.

-- There is a larger version of this plane, the RJ100/BAe146-300 or "Jumbolino." This plane could carry up to 128 people in a 6 across config.

-- I'm not aware of any other US carriers putting first class in an RJ (UA is all coach on their BAe146s) but it is quite common for the European carriers to have business class and economy cabins on their RJs. This doesn't really mean anything different in the seats, just better service and a curtain. Of course, the coach service on a European RJ is usually considerably better than the coach service in mainline american economy and sometimes better than that in F.

I find the RJs much preferable to the tine cabins of the CRJ and Embraer planes.