I've read so many BJCM threads this evening my head might explode... I still have a few questions, any advice would be appreciated! Apologies for long winded explanation in advance...
I hadn't even heard of BJCMs until I started reading this topic a few weeks ago! Have now been searching them out on eBay, and given that they're generally about £250 new, what do you think is a reasonable price for a second hand one? They seem to go for £150-200 on eBay, but I don't know if £150 is a deal or a bit steep for a used pushchair, should I just smash my piggy bank and buy a new one? 
Background:
I currently have an iCandy Cherry, on loan from SIL, due to be returned in July as she's due DC2 then. The Cherry has been great, but by no means ideal for my circs.
I don't have a car during the week, so am using the buggy in town every day, for long walks on country lanes (not off road tho), and on the tube and trains.
Also, we have 5 steps up to the front door, so it takes me 4 trips to unload - DS, then basket contents, then seat, then frame - aargh!
DS (10mo) loves facing me, screams his head off if I put him forward facing when he's not in the mood - has anyone changed from parent-facing to forward-facing successfully without too much trauma?
The things that appeal to me about the BJCM (over Maclarens etc) are; light, one handed fold, travel system/carrycot for theoretical future DC2, huge hood, long single bar handle instead of rickety separate handles (hated the Maclaren XT I tried out recently).
Not so appealing; forward facing, awkward basket.
Also - really dithering over whether to go for the 3 or 4 wheel version, I far prefer the look of the 3-wheeler, but Tiggywunkle keeps saying the 4-wheeler is a bit more stable, and she really seems to know what she's talking about!
Um.... Loooong post, sorry... 
Thanks!