Need help picking a streaming integrated amp


Need some help. I’m helping a nephew purchase his first real system. He already has good ProAc speakers so I need an all in one integrated amp that costs no more than 3k. It has to stream Tidal etc and be able to accept a phono amp. The Naim Unity Atom appears to fully fit the bill with its 40watts that are supposed to able to handle most speakers. He has a small living room. Of course he’d like tubes but I personally don’t know what streaming options are available for a non built streamer.. He’s very tech savvy. Any ideas would be greatly appreciated.
4425
As someone mentioned, the NAD 368 or 388 with BluOS works nicely and should fall between $1-2K depending on which you select (unless you can get a refurb, which you may be able to snag the 368 for under $1K).  I've got a NAD 368 + BluOS with PSB T1 and it works great.  I've used with Spotify, Tidal, Qobuz, as well as streaming from my PC.
he’s a tube kind of kid. the starting point is probably a tube integrated amp around 2k then build from there. 
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.
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.

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.  

The only necessity is that I’m not tech smart enough to discuss your suggestion. However he could figure it out easily. 
If he is willing to accept an outboard phono preamp, why the big necessity for built-in streaming on the integrated amp itself? You can get a Raspberry Pi board with a DAC or digital out board for $100, give or take a bit, that has a footprint the size of a deck of cards and has great sound. That would certainly open up the range of options for the amp, certainly if he'd like tubes.