You got some mixed advice here, and made some mixed decisions. Thanks to the power of reasoning I think you'll still be happy with the results assuming you don't blind test when the new gear arrives.
1- Cables/Interconnects don't matter. As long as they are sufficiently well made you won't hear sonic differences. The distances involved are too short to require super thick cables or exotic materials so even the basic stuff will work.
2- Dacs/streamers or any digital equipment for that matter should be bought on features not sound quality. They all sound the same at MATCHED levels. The minute differences in specs are well below audible levels. I've tested this myself, and I've read/watched other blind tests that have had similar conclusions. Personally I would have kept using the Node, its got great features, and a solid app. Hopefully you bought the Eversolo through Amazon and have free returns. If you don't believe me perform a blind comparison with the Node and see for yourself. The Evesolo outputs 2.6v while the Node is 2v so the Eversolo will be louder by about 2db, so you'll need to make an adjustment there. I could be wrong on the math, I use a voltage meter, so maybe someone else can let you know what settings to run the Eversolo to match output level of the Node.
3. I don't necessarily agree with this, but there is plenty of evidence to support the idea that all amps when played below clipping and having minimal levels of distortion, will sound the same. So in theory swapping from your Rotel combo to the Hegel will be under most conditions a side grade. My feeling on amps is that they do make subtle differences in tonality, especially when tubes are involved (probably due to the higher distortion levels). Also some amps may clip at normal levels if they don't have a decent enough power supply to cope with the impedance dips of demanding speakers. The Hegel is on paper more powerful so you might notice an improvement at higher volumes. In my opinion though, its not the way I would have spent money if I was looking to make improvements, I would have stuck w the Rotel Combo a bit longer.
4. The biggest difference maker will be the speakers. I would have put the entire "upgrade" budget into this category. What to get is entirely subjective but nearly any choice in the 4-5k price range that you probably spent on the Eversolo and Hegel would likely have been a noticeable upgrade over the B&W's.
But like I said, I'm sure you'll be very happy with the results you chose and will post a follow up response justifying your decisions and thanking everyone about how great everyone's advice was (well maybe not mine). Blind testing and staying as objective as possible is very difficult when you just spent significant money and effort making these decisions. A true audiophile would never spoil the fun and excitement of new gear with a rational and prudent evaluation.
