Well, you could go with a standard type copper coax product, or you could look for a premium silver coated 75 ohm coax for better color saturation, and definition according to many people... Silver is just as tough to beat for video as it is for audio really.
Actually, as you go up the ladder in coax quality, the differences can be very visible. This is not something that can be hidden. But if you never use one, you have no true point of reference.
Also, something else for you to be aware of: When you hear that some connectors are 75 ohm? That's a myth. It's impossible for a connector to be 75 ohm. Ask the experts at AA in cables.
Yes, they can be 75 ohm compatible, but no connector itself is 75 ohm. It's just a myth, plain and simple.