I have owned the B&W N805 and contrary to your experience I don't find the speakers to sound bright with high listening fatigue over extended listening sessions. As a matter of fact I find the N805 to be a warm sounding speaker with the distinctive B&W house sound. It may be worthwhile to explore room acoustics if you haven't given a thought about this yet as this solution is pretty cheap. Some absorption on 1st reflection points on side walls will take off rough edges and give a more smooth presentation in your small room. You can try Foambymail.com as an alternative to changing speakers.
If looking at another different speaker to get to the sound that you want, the three floorstanders above will give you the bass and speed that are missing with the N805. I have listened to the Proac Response 2.5, the bigger brother of the 1.5. Very good speaker and a good all-rounder. The 1.5 might work for your listening preferences given that you find the N805 lacking in bass and faster music. As for Totem, I have only listened to the small little Model 1's. These are bright speakers, definitely brighter with higher listening fatigue compared to your N805. The Forest may be less bright and forward with considerably heftier bottom end. No experience with Usher.
Hope that helps.
If looking at another different speaker to get to the sound that you want, the three floorstanders above will give you the bass and speed that are missing with the N805. I have listened to the Proac Response 2.5, the bigger brother of the 1.5. Very good speaker and a good all-rounder. The 1.5 might work for your listening preferences given that you find the N805 lacking in bass and faster music. As for Totem, I have only listened to the small little Model 1's. These are bright speakers, definitely brighter with higher listening fatigue compared to your N805. The Forest may be less bright and forward with considerably heftier bottom end. No experience with Usher.
Hope that helps.