The TZ set is about as complete as you can get.
Complete, yes. HD, no. I want to have my cake and eat it too. With mint frosting.
Imagine a Star Trek set as complete as the TZ set. That would be unreal. The first season TZ set comes with a copy of the TZ Companion. Almost every episode features some sort of extra, from isolated music score, to commentary, to Marc Scott Zicree interviews with cast, writers, and directors which served as the background material for the Companion. That's not even counting the extra features disc.