Welcome and congrats on the excellent gear purchase!
That older Onkyo gear was pretty good. Back in the day, I had a Onkyo DX-C320 6-disc changer. I never had an issue with it and it sounded excellent. It sounded much better than my oldest brother's Carver SD-A450. Also well outlasted it as he had issues with his. It also sounded better than a Parasound C/DP 1000 I had. I bought it new in 1995, sold it 10 years later and have regretted it ever since, though I don't listen to CD's anymore, so...
As for the M-500 and C-1 you have there... If you think the C-1 sounds good now, wait until you have the BillD mods made to it. Those mods bring it WAY UP in performance. Likewise for the MKII mods on the M-500.
BTW, I'm also in Florida. I don't ride a fast bike, but do drive a fast car. :-D