I have N800's and 802's, and they never sound and I quote "Flabby/slow/bloated maybe but never tight". I guess that individuals experience is way different than mine and perhaps did not have a good room or setup.
I have driven these with Mark Levinson, Bryston and ASR's, and bass was great and tight, but for me a lowly 140watt monoamp with 4 KT88's per side gives me the musical experience that I have yet to hear in any system outside of my own. I know, bragging and all of that, but the truth is, my wife and I both agree that we have yet to hear anything sound so natural as our system.
Do yourself a favor and if you are interested in a particular speaker, try them at home and set them up correctly, then make your selection, otherwise you are going to get a bunch of opinions, some with more experience than others and some based on stereotypes from only one listen in less than ideal listening conditions. Your amp choices should be tried with the speakers so that you can verify for yourself if the amps will harmonize with the speakers and your room.
The 800 series are a great speaker and they have brought us many hours and years of musical listening pleasure.
Ciao,
Audioquest4life