If you lived in the country, The National Party, if you lived in an urban or rurban seat, the Liberal party, unless you live in the bush in TAS, WA and SA (no Nationals) or anywhere in the Northern Territory (and then you'd be Country Liberal Party).
Liberal Party: Economic quite right wing, and whilst historically the've been pretty borderline on social issues, they are now heading towards much more social conservatism. The probably next Prime Minister, Peter Costello, is a lot more moderate on social issues then the current PM, John Howard.
National party: Agrarian, 'moralistic' conservative party, in a coalition with the Liberal Party and CLP to form government.
Country Liberal party: Basically, the Liberal and National Parties don't run in the NT, so the CLP is the conservative party up there. They only hold one seat, but there are only two in the whole territory