Rumour has it that Aurender will be Roon certified “soon”. Not sure if that’s true but others posting here are.
I actually think your budget offers you the options you’re considering. And, each - Innuos, Lumin and Auralic will likely offer you a very signficant upgrade in sound.
I may have inadvertently led you to believe that you have to buy more Auralic gear to get great sound. In ase I did, that was not my intent so let me try to clarify. At your budget and with your requirement that Roon be an option, I don’t think you’ll do better than Auralic Aries G2.2. You might match its performance with Innuos or Lumin - I can’t say as I haven’t heard their latest in direct comparison. The G2.2 is brand new. The Auralic has the option of improving its performance even further was my point. I don’t see how you could easily do the same with Lumin or Innuos. You’d have to replace their gear - not add to it.
To your point of the cost of a Roon endpoint with streaming - I agree. It’s an expensive hobby. But many of us have found it beneficial to add an outboard streamer. I offer an experience as an example. I took my older Auralic Aries G2.0 streamer to my local dealer to audition with the Simaudio Moon 680D DAC - which has their Mind2 module built in. We connected it via USB (remember that Auralic’s Lightning Link is their best sound connecting - but proprietary to Auralic). The 680D was a $9k DAC and it sounded very nice w/ their streaming system. However, when connected to the Aries, the performance jumped significnatly. It was an easy comparison to make and the sonic improvement was enough that upon hearing it, most here would never go back Mind2. I know of several people here who added the Auralic Aries (and Grimm MU1) to the Mola Mola Tambaqui DAC - even though that DAC can also stream. Again - big improvement.
Quality outboard streamers bring as much (or more) to what we’re all trying to achieve here than the DAC in my view. Of course, YMMV so an audition is warranted.
Best,