I've dumbed it down A LOT here but...
True Hi Def (full resolution HDTV) gives a picture format of 1920 x 1080 at 24 frames per second.
That is the source we create (I work in the film & TV industry) that goes onto Blu Ray disks & also give to the broadcasters to transmit to your homes (for those of you that have HD satellite or cable).
You need a 1080p capable display to properly to render this in it's entirety. If you don't then your TV will be downsizing the signal to 1080i, 720p, 720i etc.
Doesn't matter if you're using a 120Hz or a 60Hz display, the data going through the cable is still 1920x1080 @ 24 frames per second.
The cables we use at work are built by our tech guys & are good basic shielded cables with very good quality connectors.
Our cable runs are huge & can have dozens of cables bundled together, running 20m away from the source.
There's no signal degradation issues.
Until we start pushing more data down the line (1080p@50 or 60 is in the works) & unless you have a long cable run, there's no need to spend big $$$'s on cables.
Just my personal experience.
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