Mitch in trying to address your original post. Leaving perceived value out and just honing on sound quality, my Optical Rendu being served by the SGC Sonic Transporter i7 is my 3rd best sounding rig. My Innuos Zenith M3 with outboard Pheonix reclocker is a clear step up even with Roon. (Like you I have a lifetime subscription) Now if instead I use the Innuos Sense instead of Roon, now it gets way better still. Flipping between Roon and Sense does take a configuration change and services to restart. (Perhaps a minute total)
I also just purchased an Antipodes K50 which was purchased used within your price range. It does the Roon dance right with lots of user installable HD space, speedy interface and a high quality streamer in one box.
Purely based on the 3 streamers you presented, the Auralic would be my least favourite (on the cold side to my ears) then the Sonore Optical Sig, however the Innuos to my ears is a significant upgrade. Good luck with wherever you land!