I bought my Eklipse after comparing it with the CJ PV12, Art Audio, Kora Eclipse, Kora Equinoxe, Belles, and Plinius CDLad (I have the Plinius SA100/3 amp). Ultimately, it came down to a battle of the Ek/clipses. The Kora added a bit of sweetness throughout it's entire musical range that while it never called extra attention to itself (as compared with the CJ, Art Audio, Belles and Equinoxe), was very obviously "flavoring" the music. To explain -- the other preamps called more attention to their colorations by not having them appear throughout their entire frequency range. so you could hear the "humps" in each, to the degree that they had them. The Eclipse had no such "humps" and was smooth through its range, but it was nonetheless obviously sweetened (of course, IMHO).
The Kora was beautiful and seductive, and I almost went for it (I really went back and forth between the two), but ultimately, I went with the AudioValve. The Eklipse was just so clear and tonally correct to my ears, and had the best top to bottom extension of the group. I also really preferred it's look to the Kora :-)
You don't mention your amp or speakers, but that will also impact which would work best for you. If your system leans toward analytical, you might be better with the Kora. If you are leaning towards the romantic, then the AudioValve may help keep you from going over the edge. If you are looking for "neutrality" then I would definitely suggest the AudioValve over the Kora.