Seeking to upgrade my CD transport

I just looked up the Shanling. It has terrific features, and the price is good. I would love to try this because my D.BOB does not work on my best DAC.

 

Add SACD Playback to Your System: Shanling ONIX Zenith XST20 SACD Transport Is Compatible with Nearly Every I2S DAC, Features Audiophile-Grade Sound and Build

Play any SACD in true DSD quality via any external DAC with DSD capability with the Shanling ONIX Zenith XST20 SACD transport. Equipped with custom hardware that allows for switching between 10 I2S pinout modes — ensuring its compatibility with practically all I2S DACs on the market — ONIX Zenith XST20 offers full native DSD64 or DSD64 DoP over the coaxial, optical, AES, and BNC outputs. Support for multi-layer and single-layer SACDs as well as MQA CDs adds to its versatility. 

Measuring 2.83 x 12.59 x 9.44 (HWD) inches and built to meticulous specifications, the rugged ONIX Zenith XST20 features a convenient top-loading design with a classic disc clamp, 25VA Talema transformer power supply, and audiophile-grade drive components. Smooth, detailed, extremely clear sound ensures you’ll keep returning to your disc collection for more. A 3.4-inch touchscreen and unobtrusive 2.3-pound footprint further help ONIX Zenith XST20 one of the easiest, hassle-free ways to add SACD functionality to a DAC-based system.

You mentioned possibly upgrading to a Berkeley Alpha Series 3 DAC.  I have one and it's a great DAC.  Be aware, however, that it only supports up to PCM 192, so I don't think it would work with an SACD player, at least not to play the DSD layer of an SACD.  

I have the Onix. I send SACD DSD to a Denafrips Pontus II 15th via IIS and the SQ is fantastic. Prior to that I had a McIntosh MCT500 to the DA2 of my C2800 via MCT (din) cable. The Onix/Pontus is a bit more musical and smooth, while the McIntosh had a bit bigger soundstage and was a little faster.  But overall SQ level is quite comparable. 
 

If I am reading that D.Bob thing correctly, it is sending the digital to the DAC via optical or coax. If that’s the case I don’t understand how DSD64 is preserved from the disc. 

Marantz sacd 30 or marantz sc 10 are great usa service center,read the reviews to find specific. Accessories for less has the refurbished 10 for 4 k as I paid 8 k for mine new and have not had a problem. Enjoy the hunt

Not sure of your price range, but both the new and older transports from PS Audio do both, but you’ll need I2s on your DAC.