I would start with a good DAC that has all the inputs that you will need. You can connect a tv with an optical input and you may also need an analog input (for ota) into your preamp, a coax from your Oppo, etc. This will improve audio a lot once you bypass the pre and Oppo DACs. The prices of good sounding DACs has come down in the last couple of years. I use an LKS which I like and is now at $1100 but there are many others. Good luck and have fun.
2k to 4k Streaming DAC
I have a Anthem STR Integrated amp with floor standing Focal Aria 936 speakers. I have been using a Oppo BD-105 for streaming Tidal via XLR. I had a Pro-Ject Pre Box 2 Digital that I hooked up to the Anthem via RCA out and used a laptop to stream Tidal Masters and it sounded a whole lot better. I want to use an ipad to stream Tidal MQA files and think a new DAC with streaming would do that. I have read about Mytek and Element X.Are there others I should look at.