How many SACDs do you actually have? Are you really going to get more? Is it time to turn to Tidal, instead, and just keep the functional Oppo? Think about that...
An inexpensive thing to try would be to get an inexpensive CD player, say a Yamaha from Crutchfield which you could return if you want, for example, for less than a couple hundred bucks, and A/B them for CDs... heck even get something off craigslist locally, cheap. Then, see if you can actually hear a difference; that would be educational... I mean, I run an old industrial-type Sony CD changer directly into my Marantz Ruby amp and it sounds amazing - everybody who has heard it agrees; I paid $100 for the Sony, used, and it keep chugging along and sounding beautiful all the while, all day long, five discs at a time one after another. In my other system, I run with a three-cd changer by... JVC! It's been running reliably for years and years, I bought it used at least fifteen years ago, and again my guests sit up and take notice without me even pointing out my system... they ask about it, without prompting. (I entertain 16 - 30 guests two or three times per month, low-stakes poker get togethers... some of those low-stakes players are high-income people who just like poker for fun and could afford whatever stereo system they would desire -- the audio-interested ones are consistently taken aback by how little I've spent for the sound I get, when that discussion has come up, so it's not like the JVC ain't cuttin' it). What I'm saying is that your OPPO might be better than you think, comparatively to expensive new gear, when it comes down to it...
Likewise, what about trying a new bluray player as your all-in-one... if you don't need the SACD capabilities. Perhaps a Sony 700 for about $200, or that top of the line Panasonic bluray player for about $1000... get everything all in one.
That said, I also have a Marantz Ruby CD/SACD/DAC that I recently got, just to match my Ruby amp... it, too, sounds amazing but I haven't had it long enough to really analyze how "much" better than the old Sony it actually sounds in practice in the home not theoretically ... my guess is that for everyday sort of use it would be tough to tell, but in my dedicated listening sessions I'll hear a diff. But you know what even if I don't hear much of a diff I still like the Ruby thing, it's gorgeous, it's built for a lifetime (although so is that Sony apparently, at 17+ years old and ticking), smooth as silk operations, and the DAC will come in handy for my Bluesound Node 130.