In the"great bang for the buck" category, consider the Odyssey Stratos Extreme SE monoblocs, expecially if you can find one of the pairs that Klaus did as an all out assault with components from the German Symphonic line , built similar to the "one offs" he built for himself. He did about 4-5 pairs of theses and they occasionally come up on Audigon. They can be had for about $2K used and nothing in my experience under $5K can touch them.