I currently have the UHA-6S.MK2, which is excellent amp and I am 100% satisfied. This little amp can even handle 1.5 volts of DC offsets from my LOD and cancel it completely at the output to my iem's. According to Nick at Leckerton, who designed this amp, the UHA has no dc coupling caps but has no problem dealing with a few volts of DC input.
Now I would like to try another amp with similar design. Please recommend one or more, and I like the amps to be neutral and transparent.