The camera choice has been discussed several times on this forum.
What program to use for viewing. I can only comment on my particular
experience. I have the C-Swing analysis program. It is happy with the
.avi video format generated by my FH-20. There is an interesting thing
about slow motion files. It can take forever to move through the file.
Even 210 fps presents this problem. What I have done is use the normal
video frame rate and then use C-Swing's various slow down speeds to
view the file.
Can you e-mail the file? These files can be really big. Many providers limit the
size of e-mail attachments. If you are shooting students swings, then you
can keep the individual files smaller. I am shooting mine solo. The camera
has no remote shutter provision, so I just let it run.
My FH-20 works fine and uses rechargeable AA batteries. Would I buy the
newer model? Probably yes, just because it's newer.
Remember, you will need at least an 8 gig high speed flash memory card and
a USB card reader.