I have a Zenith CRT video projector. The only input is a BNC connection. What type of cabling would give the best picture quality. Right now I have cheapo DVD and VCR, but I do all the switching through my Integra DTR-7.4. The outputs are the standard RCA or S-Video and composite. I know I have to use some kind or kinds of adapter(s). Right now I use an RG-6U cable with an RCA adapter out of the reciever and a BNC adapter to the projector. Picture is good but am I missing out on better, Thanks.