So, you were looking at cables over $10K, jacked up a loaner set that you had for 2 months, and now balk at $6k? I feel sorry for your rep and dealer.
Some advice that someone should have given you already: your overall system would benefit a lot more from better speakers and amps than it would cables. Just recently I had your same setup, and it’s “meh”. You’d be MUCH better off investing that money into better components. Given how narrow you have them placed, 800s are far too big if you don’t have more room for them anyway. Go for higher quality smaller speakers and a sub. There’s a set of MBL120s and a MBL amp on Audiogon that would mop the floor with your B&Ws.