Freemand, I wanted to try a really big, powerful amp, for a change, so as to see if it lights a fire under my speakers to any significant effect. Also, my listening actually includes more home theater movies than two channel music, so my top priorities were dynamic attack, uncompressed sound, and authoritative bass.
I was leaning Pass, but the more I read, and spoke with a few people, I came to feel the Krell might be more appropriate. Another factor is that, in order to get as much power in a Pass(X350.5) as I got in the Krell, I would have to spend $2000 or $3000 more.
Also, I was able to audition and compare a Krell FPB300cx against a set of Pass XA100.5 monoblocks in the same system. Now, what I observed was that the Krell was indeed more dynamic, while the Pass did render the music with better soundstaging and authenticity of instruments, as should be the case with the Pass pair retailing for $16,500. But the Krell was no slouch either. So, I decided to try a Krell.