Headphone Amp for Focal Utopias?

The Simaudio 430HA is the best headphone amp I've owned, and I've had many.  The Sony TA-ZH1ES is also very nice and includes a really good DAC if that matter.  There's a DAC available for the 430HA, but I don't have it so can't comment on it.

Both amps have a lot of power (not that you need that much with the Focals), lots of connection options, hi/lo gain switches, and very black backgrounds.

I have no experience with the other two you mentioned.

I use Focal Elex with the Simaudio 430 HA and it sounds wonderful.  I've only listened to the Utopia briefly, and not with this amp.  Definitely take into consideration what type of sound signature you prefer and find something complementary.  I've actually heard the 430 HA described as being "soft", a description which I don't agree with.  We all hear things a little differently.  I find it to be very detailed and neutral and a good match with all the headphones I've used with it including LCD-4, HD800, and Sony MDR-Z1R.

I was curious about that also yyz.  I have the Focal Elex from Massdrop and they seem to be very well made.  I would expect the Utopia to be better.  I have a lot of headphones, so the Elex haven't been used on a regular enough basis for me to say they're "dependable" or not. 

I've heard of the Meze brand, mostly due to an offering they have on Massdrop.  The  Empyrean looks nice.  Keep in mind that an open back design may annoy others if they are nearby while you're listening.  A closed back design will keep most of the sound in your ears and not in anybody else's.  Other than that, they look light, like they should be comfortable, have a number of cable choices, and are easy to drive.  All good things.

Please share your impressions of the new headphones when you get them. Headphones are great, it's like having a bunch of different speakers to choose from.