Hey!
I would recommend Syntheyes. PFHoe may be cheaper for now, but I think you will thank yourself if you buy Syntheyes, just because of its speed and features. For example I use Syntheyes also as my favorite and fastest movie-converter. It is just performing well in every aspect, and it also gives you object tracking. I do not know PFHoe very well, but I tested it and compared it with Syntheyes. In my opinion Syntheyes won. http://www.vimeo.com/10438492
But I have to say, PFHoe is also pretty straightforward and produces good tracks. If you can do without the speed, bells and whistles of Syntheyes, PFHoe might be a good option. But then you should go for the Pro version, except if you can live without the option to use image-sequences.
But both apps have a demo, so you can try for yourself.