I don't wear cologne, really, but if I do, maybe once a year or less, I like Drakkar Noir:
Also, my sister once gave me Paco Rabanne XS, a long time ago, but that's one I wear about once every 3 years:
Those are the only two I own, and I've had them for years. I can't imagine myself ever shopping for cologne. My natural scent is fine, as long as I've had a shower not too long ago.