I, too, have the K & K and would stack it against any phono stage in the $4K or so range. However, when the poster asked for a phono preamp I thought he meant a pre with a built-in phono stgae. Otherwise I'd have recommended the K&K before this. It can also be built by Kevin Case if you are not a builder yourself. You can look at the site:
http://www.kandkaudio.com/
Or, you can go to the Art Audio site and look at the Vinyl Reference. The K&K is basically the Reference without the faceplate and external power supply It should be since Kevin designed both. At least that is the way I had mine built.
http://www.artaudio.com/
I've heard every stage mention thus far except the Coph Nia and there is really no contest, IMHO. If you need more info, e-mail me.