Im assuming you're new and by that I'm wondering if you know how to sharpen your own heads,, trust me its a pain if you don't know how so lets assume you dont.. I highly recommend for a 40lb bow you get magnus stingers or something that is ready sharp out of the package forget the sharpening learn that over the summer Id rather your head cut good right now,,,,,, the sharper the head the more blood on the ground with a wound that will take longer to clot up because of the cleaner cut.
2 -blade stingers, maybe even 3 blade vpas. call 3 rivers on the phone and ask them what they have that they recommend they will set you up!