Beginner choosing amp help

Get an integrated amp with a nice dac and network streaming capabilities. You can find some that are roon ready and then you can just plug Ethernet in the amp and your computer can send tidal right over WiFi, into your network, and into the amps DAC.
 LUMIN M1 or something like that. I thank NAD makes one. And possibly McIntosh Ma5300

Some good thoughts above. You will need to decide if the ML Motion
is a long term keeper or a likely future item for upgrade. Best advice
is to read, listen and learn. Your preferences may change the further 
you get into it. Good luck!

Having auditioned both Luxman and Hegel integrated amps recently, Imy opinion is that both would provide noticeably better sound. Your speakers are 4 ohm and the manufacturer recommends amps with 20-300 watts power. That’s an overly wide range and I would recommend erring on the side of having more power, especially given the 4 ohm impedance of your speakers. Hegel amps are real powerhouses, and the H190 at 250 watts at 4 ohms would be a good fit. While at $4,000 it is a bit over your budget, it has the advantage of having a nice DAC as part of the package and it has an Ethernet port. My dealer indicated that certain Hegel products should be designated Roon ready in a matter of months. Purchasers of units before that upgrade will be able to download a firmware update to make theirs Roon ready.

Audition one at home (and some of the others recommended) and listen on your speakers in your room. That’s been my rule for many years and it has served me well. Dealer showrooms are often treated with acoustical panels and can sound dead compared to a listening room in a typical house. 

OP: Just FYI, the Luxman 505 is on sale because vII is out. I would call the dealer to see how many are left or that choice will beade for you.

I scored the last 507ux in the US. 😀

You may benefit from taking your time, as someone suggested, and research your options.

For instance:

Do you want to display a rack of gear, or have a slick, minimal setup?

Would you consider buying used? If so, you can stretch your dollar considerably. 

Are you a fiddler/tweaker, or a buy it and use it type? If you think you will want to upgrade this or that, you might not want an all in one solution.  

There are are other considerations, of course...

There are knowlegeable folks in here when you narrow it down down a bit. I hope you enjoy the process!

Best,
Gary