Levinson or Krell

The 33H would probably be more on the "musical" side while a bigger Krell more on the analytical. I state this with reservations as I have heard your speakers with Krell 600 & A-R, side by side. The ML I heard with other speakers, so I'm extrapolating. Also pls note, I judge by classical music. Your gear is in the big league though! Cheers.

I have'nt heard the Krell 350's but as a general rule Krell's don't seem to be as musical and can be fatiguing over time. However these differences are small and may not bother your ears.
Also try out the Proceed which is a cheaper version of Levinson and is also very good.

I'm happy driving my W/P 6's with Pass X600 monoblocks. The Pass's have pure, smooth, liquid midrange and treble ranges and are OK if not great in the bass. This is a good fit with the W/P 6 which tends to be a little hot and very revealing in the midrange and treble. I don't think they need a lot of help in the bass, so the Pass's are fine. The X600s put out more power than I need for the relatively efficient W/P 6's, so maybe a smaller Pass would be more appropriate. I listened to the Levinsons and thought they were a little veiled or laid back. The Krells sounded a little colored, especially in the bass regions, amazingly for a product at this price level.

I have heard both extensively. The Wilsons are very revealing speakers but a little on the dry side by themselves, in combination with the Krell they get pretty analytical and fatiguing after a while. However being this a matter of preferences, I acknowledge that many people like this combination. I have a good friend that has it with also a Krell cdp/pre unit, extremely revealing but a little bright arid and fatiging. You have a much better front end (one of the best) so should'nt be as much.

Levinson gear on the other hand, would give you a more musical and less analytical/fatiguing presentation. However if you want to really get your system to play music, do your self a favor and try the Lamm M1.1 hybrid monoblocks. They are mainly solid state amps. with superb punch and a single tube in the gain stage that will give you an superbly musical presentation with all the virtues that any Krell or Levinson gear may offer and much more,check it out.

If for any unthinkable reason you are not convinced with Lamm, other worthy alternatives and better matches with your speakers would be Jeff Rowland (specially the old gear, 8Ti and 9Ti) or Ayre. But please, whatever you do, stay away from Transparent cables which tend often to be combined with the Wilson/Krell combos, (more brightness into your system) unless of course, that is your prefered sound, in that case just go ahed and remember is the music that matters, enjoy it.

I have heard your speakers with a Krell FPB 200, ARC VT 200s and Reference 300 Mk IIs, VTL 150s and Lamm ML1s. Quite frankly, any of these will give you a lot of musical enjoyment; I thought the Krell to be too analytical for my tastes, but I'm a tube lover so you should recognize my bias (I thought the Lamms and ARC 300s were the best with them, FWIW). Given your preamp, the Levinsons might be a better choice than the Krells, simply for the synergy of the same manufacturer's sound. However, if you liked the way the Krells reproduced the bass with the Watt/Puppies and that was what you liked best about them, I'd say go with the Krells, because none of the amps I've heard seem to be able to control bass as well as the big Krells do (others may reproduce a fuller bass, but not have that absolute control over the speaker in the deep bass).