There will always be something healthier to eat than what you're eating right now, so it's all about what level of eating fanaticism you can live with.
The two energy bars that Tynan offers as good are natural and raw, but half of their calories come from fat. Healthy fat, yes, but if you want to fuel your body optimally you won't get that from 50% fat. You need more along the lines of 40% protein, 40% carb, 20% fat. If those bars were your only or primary source of fat for the day, then fine. But otherwise, it's not exactly that great.