A good color means natural. Look carefully at a fistful of hair in the mirror. See how each strand has a different tone? Perhaps even different colors on one strand? These are the natural striations that Mother Nature gives each head of hair to work with natural lighting. A good "color job" must duplicate these natural highlights to be effective.
Then how committed are you to your color choice? In other words are you ready for a permanent change or are you still dabbling so that semi_permanent color would be a safer way to go?