@MartinTransporter nailed it…
I would second the NiBL it is an everyday carry for me.
For a more traditional separate DAC and amp combo I would say the JDS Atom, and the Schiit Modi.
Also a good DAP would work great, the Hiby r5 has good reviews and works well. There are a decent amount of DAPs in your price range that would easily fulfill your requirements/needs. @antdroid just did a bunch of comparisons of DAPs in the last couple months and would be a good resource for you to check out Here