This is a little outside the box but here goes. Pick for yourself your favorite a/v pre/proc with balanced outs to all channels. Then buy as many GENELEC ACTIVE monitors as you want!(this company is based in Finland and have been around for 20 yrs.) As much as i love audiophile speakers driven by great amps, the above setup will pummel all comers. These speakers are of extremely high resolution(in a good way), and they Will Not Bottom out ever! The Genelec model HT 208 is a two way w/ a 1" twtr and 8" mid/woof--they play ~45hz to 22khz. Capable of 120+db without compression for sustained periods of time. Cost is $2300ea. Bear in mind that includes the built in amps. Also active crossovers feeding bandwidth specific amplfiers(120watts per driver!). Add the subs of your choice, spec the right balanced interconnects and you have a HT that is most impressive. Your room is pretty large, so its gonna take some serious gear to pressurize it without blowing up, this scenario will do it for you with ease.
