Wadia, with volume control any model best most neutral digital around... I use it with Khartago mono's, which run 120 amps of current each, 120,000 mf each, and plinith transformers. But unfortunatly the Wadia will run you about Double the cost of your khartago new and thats used wadia pricing!
But honestly depending on your speakers, I highly suggest trying a CD direct into the amp first without buying it, Mainly because I believe you will get better results with a full fledged pre-amp in the system, it will most likely sound a little thin and lite on the bass. I use a Mcintosh Preamp between my Wadia and Mono's, and it has Tone controls because my speakers do not reach super low and need a little Equalization in my large room. So I feel you might get a little dry sound without a preamp.
But honestly depending on your speakers, I highly suggest trying a CD direct into the amp first without buying it, Mainly because I believe you will get better results with a full fledged pre-amp in the system, it will most likely sound a little thin and lite on the bass. I use a Mcintosh Preamp between my Wadia and Mono's, and it has Tone controls because my speakers do not reach super low and need a little Equalization in my large room. So I feel you might get a little dry sound without a preamp.