When I typed up my 2nd response yesterday, the only responses I saw were the 1st 2; mine and yours with the specs. After reading some of the other responses, as well, I would like to add a few things.
The first is that you are witnessing a truly rare event on Audiogon; everybody is agreeing on something. I'm laughing as I type this but its true. Amp specs are the most ridiculously over rated claims, not only in this industry, but just about any other, as well. If you want a really good example, go into a store like Walmart, or something similar, and look at one of those home theater in a box things they sell. They claim 1000, 1500 2000 watts etc. and they cost anywhere from $100 - $200. The only thing I can think of that compete with that kind of power for the $ is a hair dryer.
I did have a look at the measurements posted on the web site you list. At first glance, it looks well done, but if you know what to look for, you will soon find the results are very inaccurate.
Look at this: "Here are the 8 ohm results for the EP2500 amplifier rated at 450 watts/channel 20-20KHz at <0.1%THD both channels driven. If you are wondering how much more power this amplifier will give up before shutting down, it won't! This is the ragged edge for this amp. It will either go into oscillation or shutdown from thermals before giving more power." Its clear that the person testing this amp found its limit. He claims any more strain will shut the amp down.
This is his very next post for the same amp at 4 ohms: "Here are the 4 ohm results for the EP2500 amplifier rated at 650 watts/channel 20-20KHz at <0.1%THD both channels driven." His results are listed in the chart but if you look, he's getting over 600 watts at most frequencies. This is impossible given his last statement. Remember, he says in his 8 ohm post that any more stress will shut the amp down. The 4 ohm test is A LOT more stress on the amp. If he was right about the amp, it would not even be able to complete the test a 4 ohms.
The only reason that I'm going on in such detail is that your situation is very common and probably the biggest reason most people stay away from high end audio. They make comparisons just like you are doing and come up with the conclusion that audiophiles are crazy. You don't have to spend anywhere near that amount to get X performance. I agree with the crazy part, but I don't think you should take my word for any of this. I would highly recommend you find a good dealer that will work with you and bring your amp in to the store and compare it to a few other options. Bryston is great, but there are many other great brands out there, as well. Then you'll know for sure. Whatever you decide to do, I guarantee that it will not be a waste of your time.