IMHO the Wilsons sound more like live music with Krell. The Levinson doesn't seem to have the speed and dynamics that the Krell provides. Just my opinion. You should be able to audition both with out to much effort. At these prices, I'd listen to a lot of alternatives as well. I haven't heard the Wilsons with as many other electronics as the previous posts. Though I haven't heard the Wilsons with them, I have always liked the Pass gear!
Levinson or Krell
I am currently putting a seperate listening room in my home and have listen to a wide variety of equipment. I have a pair of Wilson Watt Puppy 6's and I am currently shopping for amplification. I also own a Mark Levinson 38s pre and a Wadia 270 transport\Wadia 27ix dac. I have heard the Krell 350mcx's on the Wilsons and like the sound very much however I have heard lots of good things about Levinson 33H's paired with these speakers. I have yet to hear the Wilson/Levinson combo and I am open for suggestion.