Getting back in to audio- Source help


Greetings everyone, I am turning to the more knowledgeable brethren for some guidance. 
After  a 10 year hiatus I am finally giving myself  a dedicated listening room and buying a new system. I used to have midrange  Conrad Johnson separates through magnepans and listened to CDs and FLAC through a Mac to Dac. I loved the warmth of the CJ and the soundstage of the Maggies. 
I am leaning towards The Maggie .7 or 1.7i With a Hegel H390. I will be hard wiring for tidal and again play flac files. My questions are:
1) should I go the Mac mini route? 2) Is Roon something I should look into and a NAS - I know nothing about them. 3) is the Hegel internal DAC sufficient? If it really isn’t does that defeat the purpose of the Hegel and should I look for a different integrated or separates? 4) I have no CDs anymore but in terms of getting the best Sound from my system, Should I look to invest in a CD player or HDCD player and play 16bit or 24 bit from disc or is stream/flac files from a drive better? 
Thank you in advance for any and all comments. 
jordanmj
Then again if you continue use istreamung n preview mode buy the best transport you can afford. It does sound better
Thank you. So will a good streamer also allow me to play flac from a drive via USB? 
What your looking for is a server/streamer. Check forum for music servers. Replaces computer for both functions.