I've been into GW games since around 1990.
I decided to start collect a pre-heresy army after reading Horus Rising, although I have been interested in the events of the Heresy period for many years.
I even toyed with a Heresy era Dark Angels/Fallen army for a while.
I also collect Eldar, Orks & Imperial Guard for 40k & Bretonians, High, Dark & Wood Elves for Fantasy.
I'm also a Moderator over at The Great Crusade
In my slightly biased opinion, the best site for all of your Pre-Heresy/Heresy Era information.
So if I have managed to raise your interest in this period, and you aren't already a member, pop over and introduce yourselves, you'll find we're a rather friendly bunch.