First gig was Magnum in 1988 supported by Kingdom Come
Monsters of Rock 1988 (where two fans were crushed to death during Guns 'n' Roses - that was quite scary).
Also saw: WASP, Anthrax, Iron Maiden, AC/DC, Alice Cooper, Guns 'n' Roses, Metallica, Megadeth, Motorhead, Slayer, Aerosmith, Meatloaf
Non-metal: The Cure, Jesus Jones (10 times - spent a busy couple of weeks seeing them every night!), Ned's atomic dustbin, Silverfish.
I am sure there are loads more that I've missed.