Al,
I am a recent "switcher" and used ProShow Gold on PC. I have Keynote but it's a Slide Presentation program--like MS PowerPoint. You might want to take a look at "Photo to Movie" at this link. You could always install Windows on the Mac to use your PC programs. I'm trying to steer clear of doing that myself.

http://www.lqgraphics.com/software/phototomovie.php

Susie