Just looking over your setup (I like the looks of your amp btw- clean lines) and wondering what your trying to get the most improvement from. Are you using the NUC just for ripping and network playback or coming that with streaming as well?
I used an integrated amp for years before moving up to what I use now- nothing wrong with that as long as it fits your needs. At the time I used a separates- a disk player and music server but no streaming. What are your highest priorities when it comes to your system?