Bacardi,
As I understand your post it seems you've confounded replacing equipment with switching from HDMI to analog, and concluded HDMI is inferior to analog. Could it be that a new Oppo BDP 83SE is an improvement over an early PS3 and an Onkyo SC-885 processor? It wasn't clear to me that you compared the Oppo HDMI with the Oppo analog. Another possible explanation is that removing the Onkyo from the audio chain improved the sound. It's often not easy to attribute a causal link.
db