Oxley park and north st marys are very different areas and can't really be compared. If you can buy something for a similar price in oxley park I'd definitely buy there instead. In general, the closer the property to the little shopping centre, the less desirable. There are also some very DOH dominated streets that potential tenants may avoid.
Beachgurl, actually the property I'm looking at is in South St Marys. However I have decided against putting an offer for it. It's on Pages road with the backyard facing Pages Road. It's incredibly noisey. I feel it will not be a good investment in the long term. Doing my numbers shows $500 negative gearing before tax and I think I can do much better if I am to have so much going out....thoughts?