@crandell25 Your not alone, streaming is easily the most complex system within our audio systems. I have vinyl setup, and even taking into account every little nuance of this pales in comparison to streaming.
While we all have our experiences to offer, there is no objective evidence that any particular setup is superior. I happen to prefer a two computer solution,ie, separate server and streamer and optical conversion for networks, my experience with other solutions led me to this conclusion. Still, there are so many variations that I can't say with absolute authority this is best for every setup. This also goes for every one of us here.
As to your particulars, I used to run Auralic Vega, I wanted to upgrade to the G2, but the Lightning Link threw me off. Proprietary solutions bother me, especially if using them is required for best sound quality. Once I started using Roon I became addicted to it's ease and completeness so proprietary software no longer interested me. Having said that, based on reviews and my experience with original Vega that should be very nice streamer/dac. The negative thing about it is running Roon on it doesn't allow for full potential of G2.
If I were in your situation, I'd be torn between keeping Vega and adding the Aires G2. Be happy with running Lightning Link and/or be happy running Roon knowing your not extracting full potential of that combo. This exactly why I chose not to purchase G2 as I knew I wouldn't be happy running Roon at less than full potentials of the Auralic devices. You could also go to the Holo May, or I'd agree with LordMelton tor the Musetec 005 (biased as I own this wonderful dac), or some other dac. So then you need to purchase streamer or run usb out of server, most servers run usb directly off motherboards, not good, so then you need usb renderer/streamer/Roon Endpoint (its really all the same thing, just different names). If you go streamer route you'll need to get switch if you don't have one already or run ethernet out of router. I could further add many more complications for you!
So, my take is if you're happy with Vega with above limitations keep what you have, add the Aires G2 and you're pretty much set. Network improvements can be set aside for now. Or you go to another dac with all it's attendant complications. While I believe you can do slightly better with setups other than your Auralic, it will be big hassle relative to keeping Vega and adding Aires. Auralic makes nice digital solutions, running Roon vs Link in reviews I'm aware of do state Link sound quality superior to Roon, by how much I can't say. If its substantial enough you don't like running Roon and don't like Link software I'm afraid you may be stuck with changing out dacs.