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.
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.