Thanks for all your thoughts, some great insights.
Just to re-iterate, this isn't meant as a criticism of the Ares II, but for me, and the difference it made to my enjoyment of my system, it just wasn't cutting it. After my epiphany, all I could think was, I have hundreds of £££ worth of electronics sat there that's not really giving me that return in sonic terms. So as I was assessing what sub to buy, it seemed logical to make the trade off that I did.
It may be that my amp/speakers, ICs, SCs are not allowing the Ares to really shine; other systems may well do just that.
But, I love the Naim character innate in the Nait 5si, and my Quad S2s have a real sweetness and character that I find very pleasing. So, I really don't want to break up this pairing right now, as they work extremely well together, As for the Node (DAC), I feel it is much improved by "cleaning-up" the Internet signal fed to it, plus 3rd party PC. (I know you could probably say that about any streaming component)
Posted here in another thread, I have my router in the next room, sat with the TV, TV box, Sonos speakers, BluRay player, Smart light hub, ISP modem and network switch. Quite congested 😊. Anyway, I have a 15m run of Cat 6a into the listening room terminating in a TP-Link ethernet/optical converter, and another converter, taking the signal back to ethernet. This made a big change to the signal fed the Node, positively. I know I'm still getting noise from the last TP-Link converter's switch mode PS, but not as mutch as I was getting from the jungle of electronics in the other room where the router lives 😊.
I think to improve the Node further, as I mentioned in an earlier post, I'll look to mod it with one of the available kits/PSUs; probably Teddy Pardo.
I conclusion, I think, as @melvinjames mentioned, the Node is a bargain, maybe a little unduly criticised. But with a little attention to the ethernet signal fed to it a PC, it can be elevated to something that I feel is an absolute steal for someone working with a similar budget to myself.
I'm not saying I'll never look at DACs again, but right now, I'm ok👌😊