My Tango story is much the same - 15 years old, utterly captivated by the whole thing, played it endlessly and managed to find meanings in all the songs that related directly to my life - even Welcome To The Room, Sara, somehow! I had it in every format and I even got the songbook, just to try and absorb as much of its atmosphere as I could.
I love the cover - I think it has a romance and a mystery that fits the mood of the music, particularly songs like Mystified, You & I part 1 and the title track. It also lent itself brilliantly to this lovely UK commercial:
http://www.youtube.com/watch?v=sUDimvPYSYA
Anyway, I love it and am hoping for a bells-and-whistles reissue next year...