amp to buy?

IMO, two "foundations" of a system are the amp and speakers, pick one and build from there. You may find an "all in one" box like Naim Uniti and others is best for you. Going separates requires some knowledge of system matching unless you have a brick and mortar dealer you can trust.

Are you building a system from scratch? What is your budget? 

We live in a wonderful time where it is possible to stream tens of thousands of CDs for about $20 a month, for lossless streaming. 

I stream Tidal and Qobuz integrated under Roon running on a Mac Mini. You’ll need something to stream to the DAC. Do you have a computer you can use?

 is it more important to have a high quality amp or DAC?

As DAC technology is improving almost by the day, I would opt for a high quality amp and get a 'very good' DAC, preferably one that can be upgraded.
I use Ayre Codex, but Schiit makes a Gungnir and Yggy that compare favorably. Both companies offer upgrades when available.
If you are starting out, it makes sense to listen to as many speakers first.
When you find the sound you like, you can then pursue compatible amps and preamps and DAC's.
Where are you located?
Bob

I'm in Canada the shops here told me that they don't have studio quality s 

i could help you setup your systemwhat size is the room? how far away will you be sitting from the speakers?how loud do you like to listen to, and what genres of music?