Headphone Amp for Focal Utopias?

Just bought a pair of Focal Utopia headphones and have been driving them through the headphone jack in my Cary SLP-05 preamp. I thought I would try out a dedicated headphone amp. I see decent deals on the Simaudio Moon 430 HA and Cayin HA-300, as well as a Pass HPA-1. Does anyone have recommendations on any of these? Would another work better with my setup? I thought about going all-Cary with the now-discontinued HH-1, but they’re hard to find...