Hi guffy, bigirck highlighted the #1 step towards getting killer abs - focusing on your diet, which you seem to be doing. What's your body fat % like? You can have a flat stomach and still not be lean enough to show abs - 7-8% should get you there (or very close).
As for training, there's really no magical routine in my opinion, and I like to mix it up with a lot of different exercises. Not sure if you're mainly doing non-weighted ab exercises, but you'll want to work the medicine ball and weights into your routine to bulk those abs up if you want them showing in a few months.