I agree with the previous poster...check the consolidator's sites (travelocity, expedia, qixo, etc...), but then go to each individual airline's sites. That's how I've always gotten the best deals, plus savings on the "processing fees" that third parties often have.
Honestly,IMHO, whenever we travel the issue that is the most pain is airline tix. It simply takes time and knowing your limits (limits = financial, travel times, etc...) I have five words for you...check, check, and check again!