Krell output. Seldom has a single manufacturer contributed so much to destroy credibility for the entire high-end audio industry.
That'd make Krell the George W. Bush of audio manufacturers!
Actually I have heard a Krell system that was well assembled back in the 80's that made the hair on the back of my neck stand up. I was new to high-end audio back then, so it may have simply been the novelty, but I do remember being awed by the experience. It was a bi-amped system using some large Martin Logan panels. I have no idea if I'd like it now that I'm deep into tubes (I very much doubt it), but it is an early experience I'll never forget.
That useless bit of nostalgia now out of the way, I'd agree with the first response; you have not given enough information to go on. What musical tastes to you have? What are your expectations? Size of the room and ceiling height? Speakers you'll be pairing these off with? Price range?
Without that kind of additional information we're all just speculating and or blowing a lot of hot air, and projecting our own narrow preferences on you.