I'd try a free trial of Expert Flyer and decide whether it meets your needs. I store a lot of itineraries on it, and have used the feature that alerts me when award seats open up (recently used that for an Australia trip). You could always start with the $5 a month plan and upgrade if you wanted to try it out for a longer time. Doesn't have as many features, but will give you a good start if you need more than a free trial.

You might also review this thread:
ExpertFlyer.com - Master Information and Updates Thread