Gold: AJA Video. Broadcast grade. They make a series of HDMI converters depending on your need:
[Link: aja.com]Silver: Apantac, Decimator, Matrox
Bronze: Black Magic Designs. Some budget options that generally work well enough. They do support UHD on a single cable, although at shorter distances. They do fail now and then, but they are cheap.
Everyone else: Monoprice, Gefen, Startech, Aten, Datavideo, TVOne, KanexPro, Swit.
Use Belden 1855A with ADC BNC-13 connectors.
I'm lucky enough to never have to deal with HDCP. Not sure if there are any options there. I am curious why you wouldn't just use HD Base-T? Don't get me wrong, I think coax is far superior, but AV integrators usually go right for the HD Base-T.