Hi, I saw so many models and range. Confused and blur

Can you recommend a media server with my requirement below

1) Can play mkv, mp4, avi, rmvb (minimum)
2) Can plug in hard disk to play
3) Can stream from my computer via DLNA via WiFi
4) can also stream other services such as Spotify/youtube

Any suggestion? I know WD TV can do that, but any other recommendation?