I own the Esoteric KO3x, and very happy with it. being able to add a better clock/dac is a big plus. You can add your lap top direct to the KO3x for playing high rez down loads. The only down side to the KO3x is you can not run it direct to your amp, no volume control. With the older KO3 you could go direct to the amp. but it would not take your lap top direct. I do not think you can go wrong with a new KO3x.
enjoy Pete
enjoy Pete