I am having a hard time choosing a power, I have been really hesitant to join, but mostly because I have a loosely defined personality for my pilot and he's a loyal type, so once the choice is made, that'll be an end. Unless of course the power goes against my principles, then there will be vengeance!
Check out the reddit pages of everyone too, to get an idea of who does what in PP land. There are loads of groups, and there is the potential for groups to be powers one day too, so supporting them might be an option.
Also, its cool not to join! You can support powers indirectly, or benefit from them without any of this.
But the bottom line: enjoy what you do! If you treat ED like an Excel spreadsheet then it will be no more fun than that! Get out and interact, there are loads of pilots and get creative!