this is one area where I would recomend a mechanical head over a fixed( although fixed heads will work very well). My turkey head of choice is going to be the Rocky Assissin, it opens fast, and with a 1 3/4" cutting diameter should do some damage to the birds. The most import aspect is to use a well tuned bow with shaving sharp heads and put you shot in the vitals.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS