I'd say that until you feel "less Newbie," stick with Chinook. Also, keep away from repositories with names showing they're for developers. You can skip worrying about this though if you just install repositories as they're demanded as part of an in-process install. Also, it must be pretty hard to mess up one of these, as I've been pretty reckless from Day 1! (If GA comes back and corrects me, follow his advice, not mine. )