I tend to stick with Innova, too. Mainly because I think they do the best job of marketing, and I can look at flight charts to learn about a disc. It just so happens that their flight ratings and charts fit my throwing style almost exactly, so I can have a pretty good idea of what a disc will do. Personally, I think Discrafts 1.6, 0.5, etc. doesn't tell me a thing about their discs.
I do throw Buzzzes and Predators though because I've tried them and I've liked them. I used to use Wizards, too, and have tried every Gateway disc except for the new Odyssey and Scream stuff. If I hear enough about how good a disc is, I'll usually try it, but just buying something cold I tend to stick with Innova because I can at least get a decent idea of what the disc should do.
Blake's flight chart and Marshall Street's flight guide has kinda leveled the playing field a good bit now, so I've been trying different discs now that I can hear about what they'll do first.
I agree with Rooster -- try everything you can and throw what fits your game best. Take into account availability, too. I know a lot of people that like brands besides Innova, but it's hard to walk into a store and buy anything other than Innova around here, so they tend to stick with what they can get easily.
"a man is a success if he gets up in the morning and he gets to bed at night, and in between he does what he wants to do."
-- bob dylan