Okay...I won't bore you to death with my story until later, so I'll give my opinion first.
Well, I'm in a private school right now, but what I noticed is that a few of my friends who travelled for over an hour to get to school have dropped out of the private system and have gone back to a selective school which is closer to their home. So, in some ways, transport may be an issue. It also forms part of the reason I'm not at a selective...more on that later...
Yes, private schools tend to have better facilities. But it really depends on what you want to do; if you're an extra-curricular kind of person, perhaps private might be the way to go, because of the more opportunities. But if you mainly focus on studying, a selective school might provide the peers you need for that. Again, I really can't say; it's all up to you.
Now, if you don't want to be bored, skip this bit.
Basically in year 6 I had my heart set on going to James Ruse. My dad, however, was kind of against it, because it would mean I'd travel for 90 minutes one way just to get there, mainly because we don't live near a station. My mother was also against it - "you are not going to James Ruse! There will be boys there!"...anyway, they only let me put it as my first pref. because once you get Ruse, you can normally get anywhere after that...strange logic...My mother wanted me to go to North Sydney Girls, because it would mean a 30 minute ride, and it's not co-ed. My dad also thought it would be a good idea. I was still fighting for Ruse at this time, mind you. However, the tide suddenly turned on me, because I won a scholarship to where I am now, as well as a part to somewhere else (stupid religious traditions). I took that scholarship because it would avoid fighting between Ruse and North Sydney. And while I have had a handful of regrets now and then, sometimes because of the people you move around with around at this school, but apart from that, I've never looked back. My school at the moment has much better facilities, and it brought out a musical side on me that neither of the selectives could have developed. Plus, I also got a chance to take Latin here; while NSGH offers it, Ruse doesn't. This private school is also closer to home, about 15 mins away.
Anyway, that's the end of my story; hope you think about it carefully and make the right choice. I don't think anybody else should make it for you, because you are the one who needs to be happy. Got me?