I have had about 10 amps in the last 2 years and they all sounded different at volume levels no where close to clipping. I sold my KRELL amp yesterday and only have Benchmark AHB2 monos left. Both of those 2 amps are very different sonically. I usually connected my amps to my very revealing and quiet Benchmark LA4 preamp. So it was mostly the amp and source I was hearing.
My next amp, for a second system, is supposed to be a $40K amp, but we will see if that is a pipe dream or reality next year. The reason to spend that much is because it will be sonically similar to an amp I owned and sold but it lacked the power I needed. The $40K amp will have much more current and power than any amp I have owned before. My next speakers can make great use of that current.
I have owned cheaper very high current amps but they were nowhere as good as what I am looking to get.
A lot of that cost is also bling though that is not important to me.