Personal Audio

I've been waiting for years for Naim to release a personal audio device, so I'm now convinced that the only way that will happen is if I go out and buy some other brand.  Surely then they will release their own offering the following day.

So the question is: which of the current high-end personal audio devices offers a sound which is most in-line with the Naim sound?

I'm thinking possibly the Audiobox Explorer or one of the offerings from HiFiMan or Astell&Kern.

Any recommendations or advice?