My top five, only currently features one Australian coaster, but this up coming season has got two new coasters opening at two parks I normally do visit once a year, but because of the two new coasters I might go to them two or three times over the course of the season. So here is my current list.
1) Sea Viper (Sea World Australia)
2) Blue Fire (Europa Park)
3) Nemesis (Alton Towers)
4) Colossus (Thorpe Park)
5) Expedition GeForce (Holiday Park)