How much better is direct BNC vs adapter


Just got my new Chord CuTest and it uses BNC coax and my Bluesound Node2 uses RCA. So I am currently using a RCA to BNC adapter with. Kimber AGDL RCA/RCA cable. I am considering buying a new cable and have it terminated RCA/BNC, but wanted some opinions from fellow Audio-goners, is it worth any further concern  to eliminate the adapter. 
2nd part to this question, is what cable under 500.00 would you pick?

Thank you in advance
128x128theo
I used a bnc adapter for a digital set up from dac to transport and later bought the identical cable with the bnc connector installed by builder, as much as I wanted to hear a difference, I could not. I did have peace of mind on the matter and am sure there are some here with more acute hearing can detect a difference/improvement. A very good cable and for half of your budget is the Acoustic Zen MC2, give it a try. Happy listening.
Thank thank you both, for your responses. You have added to my belief that the adapter really isn’t hindering performance. I am curious to try a few different cables, I brought home a Cardas Clear, but the connector won’t go into the Node2. They have a little guard around the connection although I can use my Golden Ref’s on the analog outputs. And toolblue, I have plans to try the Acoustic Zen, recommended by The Cable Co, thru their lending library. 
Audio Engineer who participates in these forums sells a $275 BNC cable with RCA adaptors.  I purchased one a few months ago.  Beats the pants off RCA coax cables I have tried for twice the price.

Don't do BNC-RCA cable.  Use the BNC-BNC cable with a 75 ohm adapter, not 50 ohms.  For 99.9% of systems you will not hear any degradation with the adapter. You can get them at Markertek.com

Steve N.

Empirical Audio

Audioengr, if I understand you correctly, you are stating that BNC to BNC with an RCA to BNC adapter is better than a cable terminated as required? So the 75ohm properties of the signal are corrected by simply adding a second BNC connector? Just trying to learn.