The Pria bars that are in the Health Food section at Coles/Woolies are realllly nice. They're around 450-495kJ per bar, and come in Choc Mint, Choc Cookie, Fruit & Nut, White Choc Strawberry and Caramel. They are absolutely delicious! It's like a rice bubbly choc coated type thing, but they are surprisingly satisfying for a choc fix. My favourite is the choc mint
They're good on sugars too!