I like the three blade heads myself, you don't need a lot of bow weight, just need to shoot it really good. Not much of a kill area on a turkey.
Three blade heads are easy to sharpen, just a few things different than two blade heads. Start with a 14" mill bastard file, lay it on a flat surface and stroke head down the length of the file, turn after each stroke, put some oressure on it, it will cut a new bevel on the head. After you get this bevel you can use a flat stone to finish, I use a double sided diamond stone,
Course and fine and finish on a leather strop. Very important to rotate head after each stroke all the way through the sharpening process.
RW