We live in Aldinga Beach which is about 40km south of Adelaide, we built down here because it was somewhere we could afford to live and in our opinion its not an unreasonable commute to the city where both me and my other half work (used to commute Doncaster to Wakefield and it took a lot longer!). We have built a house which we love, on a new estate and have made loads of friends down here (both aussies and poms), my children play out all the time and have a childhood that is not disimilar to the one I had. We feel Aldinga has a great community feeling eg. my sons are at scouts here and do lots within the community, on Sunday we went on a free guided walk around Aldinga scrub with afternoon tea provided and next month all the cmmunity groups that are down here are having an open day - get to know whats happening locally. We are 5 minutes from the beach and 10 minutes from the Maclaren Vale! To rent a 3 bed house here would probably cost in the region of $300 - mainly new properties.
Hope this helps