Coax Is Better, Well Good Coax is Better
I advise to buy good RG6 coax,
Belden 1694A, because it is top quality coax and is pretty cheap compared to expensive non coaxial cables that are nowhere as good as coax.
For the connectors, I recommend
Canare CAN-RCAP-C53 . Yeah, I know it is a connector that requires a Canare crimping tool that costs, with die, $150 plus you have to buy a cable cutter for another $50.
If you want the best in interconnects, this is the way to do it. The Canare is as close to a 75 ohm RCA as you can get. This is the same set up that Blue Jeans Cable uses and check out their prices.
They are not very expensive, yet they charge $13.50 for one 3' length of Belden 1694A + two Canare RCAs + shipping.
The crimper is on ebay occasionally for $55 or so without the die.