Without knowing your arrow weight and bow speed I can only guess. I would think you probably have just enough KE ( around 55 ft/lbs) to use either head effectivly. My first choices would be the Rocky Snyper, steel head 100, then the sidewinders and spitfires. Both the sidewinders and spitfires will work for you, but you are probably on the edge of having enough KE. The Snypers and Steelheads will penetrate a lot better with your setup. If you go with the Sidewinders and or spitfires make sure you take only good broadside shots( somthing we should do anyway), and fine tune your bow for the best possible arrow flight ( agian something that should be done with any head).

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