Digital Cables: Optical, Coax, BNC, or a simple RCA interconnect?

Until recently I've been using a WireWorld Optical cable (~$100) which I bought when I was using a Pioneer PD 65 CD player as a transport (until it died) and optical was the only out option. So, I've been using my Oppo 105 to play both SACDs direct via XLRs to my Audio Alchemy DDP-1 dac/pre and recently using the optical cable for redbook playback.

Last week I was reading up on Coax, and one thread suggested trying a regular RCA interconnect, although the connectors are not 75ohms. I had a pair of DHLabs BL-1 (older light blue jacket) laying around and decided to compare it to the optical. Easy Peasy as the DDP-1 has various input connections which can be accessed on the remote. Well, amazing doesn't come close to how much the music became alive/tactile/3D.
So, I looked on DHLabs site after reading that their D-750 was highly regarded. They will let me return it if Im not satisfied. That's the good news, but a 1.0m cable is $150, certainly not expensive, but Pangea makes one that seems extremely well thought out and it's on sale at Audio Advisor for $49.95 plus free shipping, so I ordered it. Depending on how much it blows me away I may go ahead and order the DHLabs too, just to compare
Anybody have anything to contribute?