iMac/Server/iTunes question

we have been using imac our central itunes server (it feeds our sonos home stereo system). size , other reasons, want move function standalone unit isn't used other computing. newbie, has set server in mac invironment isn't buying imac? get?

sorry going easy question, not sure purchase os , act itunes server?

 

i use mac mini purpose. serves movies , tv shows via plex, data stored on multiple drives , computers on network.

 

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