Just some thoughts...
What version of Premiere Elements Mac are you using? Version 10 or 11? Is your computer 64 bit system?
I would suggest that you look into the video and audio formats offered by the camcorders, that is,including 1080i and 1080p and associated frame rates 24, 30, 50, 60. Also, look at the wrapper format of the file (.mts, .m2ts, .mov, .avi, or other).
If possible, try to get a sample video from the camcorder of interest for a tryout on your Premiere Elements in your computer environment.