I have the same amplifier. I don’t know if there’s one that’s better. I love mine so much that I haven’t even bothered to look. I would ask Zach. He’ll tell you the truth, even if it’s not going to get him a sale. That’s what he did when I asked him the same question. He could also almost certainly direct you to the right amp based on your sonic preferences. In my case, if I do upgrade, at this point it would probably be to something like the Z10E, which is a HUGE price jump. I'm in no hurry at all.