Welcome to the world of Stageas!
1 - apparently winding odometers back is still possible even with the digital dash, not sure how common it is, but some of us have seen evidence of it before.
2 - front CV joints should be fairly reliable as long as the car hasn't had too much of a hard life. Unfortunately there are still many car owners who still treat their cars like crap, so this will obviously have an effect.
3 - never dealt with this company, even though I live in NSW, so I can't offer you any opinions there either way...
4- this all depends on your age, driving history, location, etc. I'd recommend Shannons, but I'm a fair bit over 25yo, have a garage to keep my car in, and have a good driving history with no claims and no driving infringements. Other insurers used include Famous, Just Cars, etc.