Next up... new speakers...

Go for another Brit speaker.I sold B&W's for 6 years and think pair of 803S would really flip your switches.You could look for upscale monitor like ATC (used in many studios and Brit),Italian Sonus Fabers,JM Lab Utopia so you can use sub.But if you dug the 805 then a pair of 803S (or used $0K 803D which go as low as original 802N) would blow your mind.ATC is expensive but great (used i many studios and Brit).A great value brand is Usher.Used Revel Studios.Think also if you mght want to go 5.1.If so lower price and get high value return speaker like Usher,Totem,Gallo, .I like Silverline and Hyperion as they can be ru with low power and give good return.But would have helped if you mentioned some other brands you heard and folks could say "then try "X".But be careful as a speaker you might like may require a lot of power.I never recommended the big B&W's unless someone had 200 watts because though they were rated a high sensitivity 90db they had nasty impedance dip that required current.Re-post and tell what you liked.Red some online audio reviews.I like ww.6moons.com and their "Blue Moon" awards.Somes tuff might be worth hunting for.I hear intriguing things about Emerald CS-2 with built in DSP.For imaging monitors are usually best bet( and you have great sub) so what about JM Lab Mini Utopias?New kid on block Mark & Daniel get big buzz.Get out to shops make your own critques and then get back and say "what else is in this clas or has "X" typer of sound".
Cheers
Chazz

Todster, I too had a pair of N805 with a Velodyne HGS-12 with a room dimensions just a bit smaller than you. I have always liked the B&W sound. I have recently rebuilt the entire system around a pair of Coincident Elcipse lll with upgraded wiring and spikes. They are driven by a BAT VK 31SE pre and a pair of NuForce 9SE V2 Amps. Front end is a Esoteric SZ-1 feeding a MSB Power DAC. All JPS Superconductor cables. The speakers could use a subwoofer to fill the room but everything about the system is more real and dimensional than the B&W setup. I guess the biggest difference is that the present setup makes me want to listen more often and for longer periods of time. Another speaker not mentioned are the Audio Physics. This was the other brand I was considering (Scorpios).

If you are thinking of a bigger B&W - just a reminder about my warning about on axis and off axis dispersion (which is unsurpassed in your N805 compared to all B&W's apart from the top of the line 4 way Nautilus and the old silver signature, if I recall but don't hold me to that one).

Generally the bigger B&W models simply achieve more SPL output by raising the tweeter crossover point and adding woofers to assist the famous B&W kevlar mid. (Tweeters have a tough job when driven low and without any baffle support - as in a B&W design - so raising the crossover eases their task - same idea for the midrange when you add a woofer)

Consider that what you have is an extremely good speaker - just it can't play loud before compression will affect it and it is limited on bass extension....but very very hard to beat in all other aspects.

You should look into horns I have a 30ft-20ft -13ft h sloped room designed for audio, no extra room to pressurize as you do and the only designs in loudspeakers that do pressurize this space are horn loudspeakers with bass horns.

Vandersteen Quatros would be an excellent choice.