Krell FPB200 or Levinson 334 ?

I would pick the Levinson over the Krell as the N805's may not take full advantage of the "Krell Bass". If I were you I'd look at something from Jeff Rowland.

The retail markup on high end audio is 40%. To deserve that they should allow you to a/b them. Otherwise just buy them BOTH on the used market for the same price, then sell one of them. I didn't care for the fpb200, but I will also note I heard it with a mismatched mid-fi denon cd player. Hash in Hash out. Ya mon.

The Levinson 334 is a GREAT amp - it has excellent bass and sounds somewhat analog in the mids and highs (the best of both worlds). It is also a very good match with B&W speakers. To me the Krell is more 'digital' or harsh sounding (I have not listened to the Krell with B&W speakers). These are my impressions, you should listen and judge for yourself - preferably in your own home. Perhaps each of the two dealers can lend you a 'demo' for a couple of days so you can compare them. Most of the high end audio shops by me (Chicago) offer demo listening periods before buying. Good luck.