I had the chance to listen to every preamp in the AES and the Cary line, along with many other brands, side by side and without a question the best was the AES DJH, better even than Cary's top of the line. I highly recommend upgrading to it. Also, on the DJH you have a rectifier tube. It is astounding the improvement in sound by rolling tubes. Definitely roll the tubes, the best I have found for the DJH, yes I bought one after the testing, was the old Sylvania VT-231 6SN7s and a Mullard rectifier. I have tested pretty much everything in the 6SN7s, the only other that comes close to the Sylvania is the old ECC32 Mullard - the old shoulder style bottle. Completely different sound that creates a huge center image with depth, but for most of my music I like the clarity of the Sylvanias. In rectifiers the mullard is hands down better than the supplied one I got with the DJH, but I haven't tried everything yet there. Also, with the DJH you can get a remote! I love mine. Basically my preamp search is over with this great piece of equipment.
I also talked to Dennis Had (What DJH stands for) who designed this preamp and he agreed it was the best preamp they had to (including the Cary line). But he said he is working on another for the Cary line that will be better yet, but also with a price of $3000.