Heywaj10, one thing to keep in mind in your search for speakers is what amp will be required to make that particular speaker ROCK, as some speakers can require much more from the amplifier than others. After doing a little research, it appears that from the speakers you auditioned, the Aerial 5B is the most demanding. Reviews of this speaker do state the bass as being well controlled. With its 86db sensitivity and recommended power of 50-200 watts, it is a possibility that the NAD may have just not been up to the task when playing with some volume. The only way to know is try them on a different amp. Another speaker that you made reference to is the Tekton Lore which has a sensitivity of 98db. Knowing that every 3db is either a double or half in power depending on the direction, and if we are using amplifiers of equal high quality, the Lores will only need 12.5 watts to have the same capability of the 5Bs with 200 watts. Heres the breakdown on how I determined these numbers,
86db 200w
89db 100w
92db 50w
95db 25w
98db 12.5w
Again, assuming the same quality, it is obvious that a lower wattage amp will be less expensive than a higher one, however there will be some exceptions to this.
So, do you blow your budget on amp or speakers? Neither, as they should be considered together. I have seen too many people buy speakers, only later to realize that the remaining budget was not sufficient for an amp to get the maximum performance. Also, a very high quality amplifier can play a budget speaker to its maximum, however overall performance will be limited by the speaker.
I absolutely agree that room acoustics will greatly affect the sound, but it is still important to have a good speaker/amp match, especially since you want to ROCK.