Need help picking a streaming integrated amp

Several options depending on budget.  Since you're open to Naim, that'll give you plenty of choices.  These are ones I know of:

At low end of budget, Yamaha R-N803 - $700ish.

Bluesound Powernode 2i - $900 (I have the previous model Powernode 2).

Marantz pm7000n - $1,000.  I'm about to take delivery on this to replace my Powernode 2.

The NAD's mentioned above, I think under $2k.

Hegel H90 at $2k, or Rost at $3k.

NAD M10 at $2.7k.  NAD coming out also with an improved version of this soon.

Upcoming PS Audio Strata - $3k.  Probably available mid summer.

And the Naim family you mention.

That's what I know of in the budget envelope appropriate for the speakers you have (there are many other cheaper options but I wouldn't recommend them, especially if you are open to Naim level quality and don't need to skimp).

Note:  all of these are all-in-ones, so-call super integrateds.  If you are open to two-box solutions, there are many more possibilities, and I'm sure there are super-integrateds that I missed as well.  

many thanks for very good info

Preowned Devialet 120... very good/excellent built-in phono, stream via Audirvana (or equivalent) on a Mac or PC over network (Ethernet or WiFi) directly to Devialet. Impressive functionality and sound quality in a true one-box solution.

ProAcs are great speakers. Which model does he have? I wouldn’t get an all-in-one solution — it’s a jack of all trades master of nothing, and your options are relatively limited. I’d get used separates to get him the best sound and value for the money. For $3k I’d get a Unison Unico 50 integrated (2 listed here now around $2k), an Avid Pellar phono preamp on US AudioMart ($500), and a Bluesound Node 2i streamer (around $400 used). The Unison amp is excellent and is a hybrid design that uses tubes in the input stage with solid state amplification, the Pellar is far better than any onboard phono pre you’ll get in a multifunction integrated, and the Node is serviceable for now but can be upgraded significantly down the road with a better DAC. If I really loved my nephew that’s what I’d get him, but if you don’t just go the integrated route. Best of luck.

he’s a tube kind of kid. the starting point is probably a tube integrated amp around 2k then build from there.