I used to have a C-J tube preamp in my system.
More "air" around instruments with the C-J (Johnny Hodges' alto sax will make you cry) and a wider soundstage, but I do prefer the Krells, much quieter backgrounds, more clarity and better extension at both ends.
Before replacing my Wilson 5.1's I listened extensively to Watt/Puppy 6 and later 7's. I finaly opted for the C4 (I couldn't afford the Evidence or Temptation) as I found the Dynaudios less agressive and maybe a bit more musical than the Wilsons.
I am definitely in the market for different (faster) cables.
Thanks
Jack