I started with Marines back in high school (around '94) but took a lengthy break from the game after a year or so of playing casually. I always had a soft-spot for Tyranids and, 2 years ago, got back in the game with them.
Since then, I've hit the hobby and local tourney scenes pretty hard.
All told, I've got about 6000 points of Nids, 3000 points of Marines, 3000 points of Tau, and a newly cracked Necron Warrior Phalanx (about 1750 points).
I'm also a recovering Forgeworld junkie... with a Hierophant, Tigershark A-1-0, Barraccuda, and more shoulderpads/doors/upgrades than you can shake a stick at.