I dont think fps is as important as kinetic energy, which involves speed and arrow weight. I would recomend going to a good shop and having your arrow weighed and bow chronographed. With that you can go online and figure out your KE. Personally if your under fifty I wouldn't shoot a mechanical. If your 50-60 modest mechs with 1.5 or under cutting diameters will work, if your over 60 you can probably shoot whatever you want.
If you have a lower KE and want field point flight their are heads that tune easily like slick trick, Nitron, Phathead, or ABC sonics. However you should be able to get the muzzies flying like filed points by broadhead tuning which is a hole other ball of wax!