Not that my opinion counts for anything, but if you are looking for a little bit of power without breaking the bank and paying someone to port your motor and spend all kinds of money on cranks, stroker pistons, cut domes , and etc. I would highly suggest (since this is your first banshee) getting a set of vito's superstock pistons with a fresh bore, a shaved head, or aftermarket with a set of 19 or 20cc domes, and a good set of pipes like shearer, cpi, or rockets. Those little motors are reliable, fun as hell to play on, and pretty strong for what they are. There is definetly nothing wrong with going the 4mil route if you have the money, but if money is tight, i guarantee you will be satisfied with this setup, especially for your very first build.