Peter,
I do not have a Mac, but I use Lightroom – exclusively. LR is an incredibly powerful organizer with a very good Raw converter and photo editor. I shoot everything in Raw, and have found that LR is all I ever need for post processing. I would not hesitate in recommended LR to anyone. If you go to the LR web page, you can down load / view the tutorials and they will give you a good idea just what the software can do.