Hi Jill and welcome to Basenotes! Are you in any of the major Australian cities or are you in a small town with not much access to fragrances?
A lot of us here really enjoy the niche fragrances (eg Serge Lutens, Frederic Malle, Caron etc) but these can be tricky to get if you're not in a big city.
It's difficult to recommend fragrance because body chemistry is very individual and what smells sophisticated and sexy on one person can smell like bugspray on another.
If you can get to a store, having a testing day. Make use of paper strips - don't try to spray everything on yourself right away. Take a pen and write on the strip the name of the fragrance and then choose the two you like best and put them on your wrists. Give it a few hours to see how they develop. Generally, you should give fragrance a couple of tries before deciding to buy - it saves a lot of mistakes. (We've all done it!)
I'm also going to recommend you try Ava Luxe (www.ava-luxe.com) - based in the US but they have over 100 fragrances and do a samples service so you can try the ones you like the sound of at your leisure. You are bound to find at least one you enjoy! Check out our recent Ava Luxe week for reviews and suggestions.
Finally, don't be ashamed of Fantasy - it's actually a nice and well-made fragrance and a lot of the folks here enjoy it. It's just unfortunate Britney's name is attached.