Nrenter, you are most welcomed to pop (down) by if in Mexico City. That's where I am. And my choices are determined in some way by that. It is part logistics, a bookshelf speaker is easier to move around (or bring from the US in one of my trips). Also, you don't have the widest choice here in Mexico but both the 805 and M20 are available. I can live without deep bass, btw. Hey, a couple of years ago I just had a portable cd player and some bose small active speakers. Bookshelf speakers are the next evolutionary step! was moving around the world about every 6-12 months for contracts. So everything I owned had to fit in two suitcases. Now I still travel but have a place I can call my own (or sorts) and can fill it with these things.
In the US among places there is large availability of audio gear, new or used. If there I will seriously consider used and probably would have gone for the b&w N803 or N804.
In any case my listening room is small to medium so it can be filled by small speakers and I listen to electronica, downtempo, lounge, classical, acid jazz...
My CDM1 NT still sound nice (the N805 and/or M20 would sound even better) so I am not completely seized upon by upgradetitis. If I am awake late at night chances are I am at the pub.