There is no point having 3 sets of speakers, its just a waste of money and will make it sound worse. 6x9's are used to get a bit of "bass" when subs aren't used. You don't need them since you're getting subs.
So if you haven't bought them yet, don't bother!
Oh, and you have the wrong model number over the speaker amp... You'd be better off getting the GM-6200F to run the to run the splits and rear door speakers. If you don't believe me, go on Car Audio Australia forums and ask for opinions on what you've chosen