I have had a pair of N805s for my rears since Christmas. I'm replacing my old CV mains with another pair of N805s that I just bought from someone here on the forum. The new pair arrive Monday. I can't wait. Now, I'm in the market for a sub to go with them. I do just about 100% HT.
I started out with an HTM2. I kept it for about 3 weeks and upgraded through the dealer to an HTM1. I couldn't be happier with my upgrade. I CAN hear the difference between the two. The dialogue is clearer with the HTM1 than the HTM2. The extra $1000 for the HTM1 was worth it in the long run since I'm planning to make this my center channel speaker for a very long time. And besides, two months later, I don't miss that extra $1000.00
I'm not sure how much difference you would hear between the 805s and the 804s. I never auditioned the 804s because I just don't have room for floor standing speakers right now. The N805s sound fantastic to me. I did listen to several different kinds of speakers at the dealer before I decided on my first pair of N805s.