Used vs. new

B&W : you may get better speakers for less.

B&W`s are known to be bright. You may need to spend more on your electronics to tame that bright sound, and have some amp power to drive them.

I own the 804N. Great bass. It puzzles me that others have claimed lack of bass in their B&W`s. 

I don't have experience with the B&W models mentioned here but owned 2 pairs of old B&W models for more than a decade, and I agree with few comments here that new is not always better. In my case, New and more expensive sound worse than old and cheaper. I owned the B&W CDM 1 SE close to 15 years. Midway through the ownership, I tried the more expensive model, N805. To my ears, the cheaper CDM 1SE sounds better than the N805. A matter of preference. I sold the N805 after about 3 months. 

Just to add. I will only buy used if the condition of the speakers is very good, perhaps 8.5 to 9 out of 10. I wouldn’t mind paying a bit more money for a good or mint condition pair. It’s good to have some savings if buying a used pair. The downside is most used speakers out there are in fair or poor condition, cosmetically, although functionally there may not be any issue. It’s the same with other hifi equipment such as amps or DACs etc.

If you are a meticulous person and cannot accept something that looks far from perfect ie. scratches on the cabinet or nicks etc., go for new.

New everything for me, unless of course vintage is your thing. 

Buying used is too much of a crap shoot for me. The fact the person is selling the component makes you wonder why. You don't know how it's been used, or abused. Trying to get more for your dollar buying used is like trying to get something for nothing, May very well work out, but buying new eliminates that risk factor. Better to buy a new Volkswagen, than a used Mercedes at the same price. Of course my father was a used car dealer, so I learned to stay away from anything used. Your experience may be totally different.

Mike