I am using a SS Muse 3 Signature, which I find to be outstanding. It is fully balanced, with 2 XLR and 3 RCA inputs, and one set each of XLR and RCA outputs. It also has an HT pass through, which is activated with a single press of one button on the remote. Input gain can be individually adjusted to normalize output between different sources, and it also has a polarity inversion switch. Muse considers this preamp a "statement product," and (in my system anyway) I have found it to be very musical and dynamic, with a rich midrange, beautiful grainless high frequencies and deep powerful bass. It stays on all the time in a standby mode, so it is ready when you are. I use it with a BAT VK500 and there is good synergy. I believe the new price is about $2300, and I doubt you will find one used. Although YMMV, I would strongly recommend an audition based on my positive experience with this unit, and your stated criteria. The BAT VK 40 is also said to be very good.