Welcome to the group. Congratulations on joining the military. We appreciate your commitment to serve.
My first suggestion is to wait until after Basic to see where they are going to send you before making any major purchases. 
It would be a shame to have that nice shiny new bike sitting in storage while you are sitting in a desert.
My second suggestion is to wait until after you take the MSF class to decide what bike to get. Also, check with whatever base you are going to end up at to see what their requirements are for riding on base.
As for the rest… I can’t really help you.
