One of the best HDMI cable?

It really depends on cable length. For 3-6 feet any decent cable will do. For lengthier ultra HDMI certified (Blue Jeans and others mentioned) will be more solid choice. But from 20 feet and up - no copper wire will push "full 4K resolution", ie. 18Gbps. Only newest active fiber optics cable would work without Metra Gigabit Accelerator
I changed 2 monoprice Redmere and Audioquest Forest cables before I finally got full 4K to my projector via 50 feet HDMI - RUIPRO HDMI Fiber Cable. For more information -avsforum has huge thread dedicated to tests of HDMI cables throughput, guys did an amazing job measuring and comparing, an absolute impossibility in audiophile world.

@chrisr - only until 15 feet I believe

@chrisr and even then after 25 feet no 18Gbps signal is passed, and they state it as well.

I have another observation - most UHD players and even OPPO 105 have separate outputs for HDMI video 4K and audio. In theory it is done to support older receivers/processors, which do not have 4K pass-through. In practice it has a lot of other applications and implications, but in my experience separating audio signal (it does send video as well, but  lower resolution) from video yealds a touch better sound for concert disks, May be it is a placebo effect, dunno,

CATV isolators almost a must - cable and dish companies often use separate grounding (as well as roof OTA antenna) for safety reasons, and as result unavoidable ground loops and hum of various degree. So I would install it no matter what. The only issue is dish, powered by receiver - then you will have to install separate power supply for your antenna, as isolator will break low volt signal coming from receiver to dish. Satellite service provider installed separate power for me for free by my request.