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Yeah - most tripath based amps are pretty good, so long as the speakers arent too hard to drive.
Yup - was going to ask about inputs. Spotify premium is not too bad actually, so long as you enable the highest quality output.
DIY cabinets can be a good option, but that is a big rabbit hole to go down :)
If you don't go for fullrange drivers (I am a fan of these all though many are not) then you will also need to build a crossover, so that the highs get sent to the tweeters and the lows/mids to the main drivers.
That’s a pretty good budget for an amazing second hand system.
Id look for a ps audio sprout and some obscure British made floorstanders