Nice thread this, and a great link there from chopper

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I was a huge fan of the 80s Prog Rock Revival and I have cassettes by loads of these

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I remember Trilogy well, nice band, a 3-piece in a sort of early 80s Rush style. Arctic Life (the cassette) is one I have and it's excellent. I liked those Gothique tapes too, they were a really interesting band.
Probably the rarest I have are the cassettes by Steve Wilson's old band Karma. I did SW's merchandising then so I got to hear some real rarities which never saw the light of day...
I'd love an album full of As Above So Below material. I have some stuff of theirs and by God they were good.