A good wax that is available in stores in Australia is Meguires number 26. It's the one in the beige bottle without all the marketing crap on it.
Don't know if it had been mentioned already.
Also, as it was already pointed out, a clay bar should only be used maybe twice a year, the exceptions are when:
- a bird shits on the car and it dries up
- you park under a tree that is dripping pollen all over your paint
Remember to lube up good and then park in a garage and you shouldn't need it that often.