You may have to choose a template, if that's the way you and your group decide to go, but what's to stop (if that is the case) of making your own templates? There's MUCH more to the Dresdenverse than what we've seen in the books...as each novel aptly demonstrates.
As to the OP, however, as Tush Hog stated, as per the rules, you can't take any power twice unless it specifically says so.
Of course, what's good for you and your group may be to totally ignore that rule and allow multiple purchases of powers, in which case, have fun! That is the primary goal, after all...