New or used amp?

The best mainstream recommendation is a used mint-condition Bryston 4B-ST, it is the best all-around amp out there in this price range (generally can get them for about $1400-1500), has virtually no risk of breaking, and is much better sonically than anything Levinson or Krell in the same price range. More esoteric and less powerful but somewhat more open and dynamic is the BAT VK-200 (about $1800-2000 used), which is vastly better than any Levinson or Krell anywhere near the price.

Couldn't have said it better myself Karls, I think the biggest factor out of the two would be what you are trying to power, but I would rec. the BAT over the Bryston, just my personal preference.

I second Karls thoughts. I have a Bryston 4B-ST, and at their used price, you can't do better. They also carry a 20-year, unconditional, transferrable warranty, and Bryston provides outstanding repair service.