barnesc, you may also want to take a look at Tin Hau and Fortress Hill. They are the next two stops on the MTR after Causeway Bay on the blue line and provide a more residential type of environment.
In my humble opinion, I would not live in the New Territories. Yes, it may be a great area to live, but for someone new to town, it is not the place to live. Yes, I see that you're willing to commute 30 minutes or more, but I can tell you, the commute will get old and you will hate it. I don't know how to explain it, but HK is not Chicago or NY and to commute more than 30 minutes each day will tire you out quickly.
I guess what I am trying to tell you is to live closer to where you work during your first two years in HK even if it means paying more for rent. I know a lot of people (including yourself) may disagree with me, but from my experience when I first started work in HK during my early 20s and working late in the office till 10:00pm - 12 midnight, I was always grateful that I would be home in less than half an hour.