I like Sram chains; the whole Power Link thing makes changing them pretty trivial. Everything else, I like Shimano; you can't argue with 40+ years of experience and pretty good engineering. They clearly dominate the market, and I personally think it's because they make decent stuff for a (usually) decent price.

I've read that Campognolo components are very good, but I can't afford them, and don't actually know anyone who uses them, but maybe you should check them out as well.