Hi, if you can find these in Australia; Philips SHB3165 Wireless Headphones, I have got a set of these and they are great! Will not make your ears bleed, but very well made from a trusted brand, and the battery lasts ages! Good range on them too. The price is slightly over your budget of $50 @ around $57, but i dont think you will get much better for any cheaper!
Good luck.
Kenton.