Here's what I would do.....At the Wam Fest 2018 one of the
eBay sounds around was
@greybeard's Croft power amp, LS3s, small sub, and an Oppo Sonica DAC. I was so impressed that I bought that DAC as a reference whilst building my own line of DACs. But it was the overall system that impressed as highly musical and engaging.
There's a few variants on that I would recommend:
For amplifiers a Radford sta 25 or 15 or a modded /upgraded Audio Innovations s500
For speakers there are many but small and highly musical the Rogers LS3 or JR149, which is available very cheaply.
For streamers if you want USB get an Innuos Zen Mini but make sure you also buy the Phoenix USB reclocker which is a game-changer for the sound quality
If you want i2s get a Magna Mano streamer. i2s gives a very nice lift of SQ over USB or SPDIF
There are many DACs that could fit the bill from the aforementioned Oppo Sonica (no ,longer available)-just listen long and hard and make sure it's musically engaging! .
I actually have a Radford sta35 and JR149s and I often think when they're coupled to the right DAC or streamer do I really need anything more?