Instead of thinking in terms of chords, I think of voice-leading; that is, melody line and bass line, and where the bass line goes. If you do that, you'll have the right chord. [These voices] will give you some alternatives, and you can play those different alternatives to hear which one suits your ear. Keep the bass line moving so you don't stay in one spot: if you have an interesting bass line and you roll it against the melody, the chords are going to come out right.