Blu Ray player versus CD/SACD player.

The most important part of your question was “will I hear a difference…”. The fact is, you can buy a $7500 Marantz or $16k Luxman and you may not hear a difference. Nobody can predict what you will hear. My advice is to find a dealer and ask if they can set up a demo for you, comparing your Oppo to something more expensive.  If there are no dealers, many online outlets offer 30-day trials, but know that there could be restocking fees.  If you own a lot of SACDs, you will need a stand alone player like the Marantz SA10. If not, you can add a dac to your Oppo for improved cd quality, but it won’t play SACDs. A lot of balls in the air for right now. Btw- the Oppo is not a bad player at all. I don’t think digital technology has really improved over the last few years. It’s really more that very good dacs are now available at much lower prices. 

A number of SCAD/CD player options aside from the Marantz SA10

What preamp are you using? and how is the Oppo connected to it?

@ianhorseman 

I probably got needlessly complicated in my post.  Suffice to say when I got the Bryston DAC3 I used the HDMI input for everything, SACD and red book, as the HDMI inputs seem to give results equal to their other inputs.  My room has some oddities, and I was using Room Correction software in my other systems, so I thought I would try some RC in the two channel system, thus the mini DSP, which won't work with DSD.  So the SACD replay doesnt get the benefit of room correction, but otherwise sounds outstanding as the DSD layer of the SACDs is outputted into the DAC.

   Regarding Marantz SACD players-I have owned a few, and they are very satisfying, but they do tend to roll off the top end.  Since most music lives in the midrange, this may not be terribly important, depending what you listen to

+2 from @mahler123 and @akg_ca-

it’s not that the Oppo is a “bad” device but it’s kind of a “jack of all trades”. I purchased a 105D to run through an AVR and it was cool for movies but not so much for two channel listening. The implementation of the DAC is not that great.

I’ve dumped the AVR and now only use a two channel setup. As my library is all CD (except for a couple SACD) my choice was to go with a Naim Uniti Core for ripping/storage/playback and run that through an external DAC. As of now I’m using an Aqua La Scala Optologic and have been very pleased with the results.