I would suggest using fiber. You can then use different encoders and decoders to get the signal you want.

www.thinklogical.com for example

Many companies have devices for distributing all types of signal over fiber. It would seem to be the most "futureproof" solution. Lots of bandwidth.

The biggest problem I have experienced with permanently installed RGBHV is that is very hard to stop interference from power cabling and other devices.

Cheers

Toby