Thanks for the extra info, Mike. The additional info will slightly change a couple of my suggestions.
1. Given your main speakers, the Aragon may prove the better choice, but there is really no way to be sure except an in-home audition. I do not find the Bryston amps to be bright -- they are, however, very transparent and are very revealing of recording balance. Maybe you can find a couple of audiophiles in your area that would let you try their Aragon and Bryston amps. Do you have a audio club in your area that you could contact? (I suggest this rather than a dealer, since borrowing equipment from a dealer sort of obligates you to buy their product.)
2. Your surround speakers are efficient enough that you may be able to get by with the Bryston 5B-ST. The wild care is the size of your room, and its acoustic characteristics. If price is not a huge concern, however, I'd recommend getting the Bryston 6B-ST (or the Aragon), since having some extra headroom in the amp is a good idea with a large room.
3. Your HT processor and/or DVD player should be programmable for either "small" (limited freqency response) or "large" (full-range response) surround and center speakers. If the surrounds are only capable of reproducing frequencies down to 60-70 Hz, the speaker selection on the pre/pro makes no real real difference in terms of amp power, since the speakers will need only enough power to drive them to their low frequency limit.
As a point of illustration, the surround speakers in my HT system are rated at 91-92 db efficiency, and their lower end is about 55Hz. I feed a full-range signal to them from the pre/pro. With their relatively high efficiency, the Bryston 5B-ST provides more than enough power, but my listening room is about half the volume of yours. (Remember that for every 3db increase in speaker efficiency, you halve the amount of amplifier power needed.)
4. The final point which we've not discussed is subwoofers. Given the size of your room, a good subwoofer may be more a necessity than a option. With a good powered sub, you will also relieve your main front speakers of handling the really deep bass and LFE in DVD sound tracks. Given the fine quality of your system, I think you should give serious thought to adding a good subwoofer. There have a number of threads on A-gon over the past several months that will provide ideas for which sub might work best for you.
That pretty much exhausts my ideas. I'm sure you'll get some good input from others.
1. Given your main speakers, the Aragon may prove the better choice, but there is really no way to be sure except an in-home audition. I do not find the Bryston amps to be bright -- they are, however, very transparent and are very revealing of recording balance. Maybe you can find a couple of audiophiles in your area that would let you try their Aragon and Bryston amps. Do you have a audio club in your area that you could contact? (I suggest this rather than a dealer, since borrowing equipment from a dealer sort of obligates you to buy their product.)
2. Your surround speakers are efficient enough that you may be able to get by with the Bryston 5B-ST. The wild care is the size of your room, and its acoustic characteristics. If price is not a huge concern, however, I'd recommend getting the Bryston 6B-ST (or the Aragon), since having some extra headroom in the amp is a good idea with a large room.
3. Your HT processor and/or DVD player should be programmable for either "small" (limited freqency response) or "large" (full-range response) surround and center speakers. If the surrounds are only capable of reproducing frequencies down to 60-70 Hz, the speaker selection on the pre/pro makes no real real difference in terms of amp power, since the speakers will need only enough power to drive them to their low frequency limit.
As a point of illustration, the surround speakers in my HT system are rated at 91-92 db efficiency, and their lower end is about 55Hz. I feed a full-range signal to them from the pre/pro. With their relatively high efficiency, the Bryston 5B-ST provides more than enough power, but my listening room is about half the volume of yours. (Remember that for every 3db increase in speaker efficiency, you halve the amount of amplifier power needed.)
4. The final point which we've not discussed is subwoofers. Given the size of your room, a good subwoofer may be more a necessity than a option. With a good powered sub, you will also relieve your main front speakers of handling the really deep bass and LFE in DVD sound tracks. Given the fine quality of your system, I think you should give serious thought to adding a good subwoofer. There have a number of threads on A-gon over the past several months that will provide ideas for which sub might work best for you.
That pretty much exhausts my ideas. I'm sure you'll get some good input from others.