How would you rate these 2 Channel amps

Krell and Levison are at a different level. Accuphase has had reliability issues in the past. the others are a step below.

Jeff Roland, Classe', Threshold :-))

Krell and Mark Levinson by far.
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I agree on the Levinsons (golden era). Today's McIntosh amps are pretty darn nice. I was fairly blown away by a pair of MC501's last weekend at the dealer.

I fear there are real limits to the extent general answers to this very general question will be helpful. You simply have to listen to products from the different brands to know if they are going to please you in your system. For instance, several people have recommended Krell and Levinson, whereas I personally have never been very impressed with either company's products, and most especially not from a price/performance perspective. I emphasize that this is a reflection of my own taste. While I have found a considerable number people who share my views about these brands, the larger point is that someone could probably say exactly the same thing about the products of just about any respected Hi Fi company. You simply have no way of knowing what you will like before hearing it.