I like PowerAgent for the PT, but I predominantly use my Garmin 705. I still analyze my intervals with PowerAgent though. I currently use TrainingPeaks because it is included in my coaching package (the web-based TrainingPeaks because I too am not going to pay for something like this and still have to go through Parallels to be able to download and analyze all the information).
I looked into a number of the Mac-compatible training software programs and each has their deficiencies. I preferred Ascent to Golden Cheetah and RaceDay. I think RaceDay has a lot of potential, as does Golden Cheetah, but they also seem quite complicated. Ascent is immediately understandable and not too complicated. iSMARTrain is another option.