Hi I have seen Peugeots and Renaults in OZ but they are not popular, no french car is. There are dealerships, and mechanics will work on them, especially a UK one, I'll service it for you if you are going to WA :-). If you are going to keep it till it dies then bring it although if you damage it body parts might be hard to come by as if they do do a version of it in Oz it might have a slightly diffrent body shape.
If you do decide to sell and buy a car in Oz I would probably avoid the Elantra (Sorry Kimsdu) as the reason they are cheap is because parts are expensive compared to other cars, unless you are going to buy one under warranty. Kia's are the same, great cars until you need to buy parts. Its the same in the UK you can buy the car cheap but parts are expensive for Korean cars.
I don't know what the best car in OZ is to buy maybe someone who has lived there for a while might have a better opinion but the cars seem to be medium sized then large like the Falcon or Commodore, little cars like 107 or Corsa's (Holden Barina)are few and far between.
This is my experience from visiting SA and WA other states might be diffarent.