I disagree with the fixed blades. Odds are if you are new to the sport and Tuning and tinkering isn't your life your fixed broadhead and Field point will have different point of impact.

A good mechanical will eliminate this issue guys will tell you your losing KE ect ect if you bow isn't perfectly tuned and that is true however its very negligable for most modern bows as they are pretty accurate at factory specs

My preference are Rockets I have used them for the better part of 20 years they make a mech for any bow and any game. With your setup the Steelhead or Sidewinder would be great choices!