In the early days of the Apple iPod, users used to swap their headphones so that they were less of a target for thieves, but now that everyone has one it's not so much of an issue. But there's still a very real reason to swap the headphones — the Apple ones are crappy. Better than they used to be, but still pretty bad.
If you're looking to pay around AU$100 there's probably a handful of brands you should be looking at, but the one that sticks out is Sennheiser. But like any company it offers a lot of different options at this price level and not all of them are good. The one option that sticks out to us is the PX100: a natty pair of collapsible headphones that are lightweight and sound great.
They were released in 2002 or so, and in headphone terms this makes them pretty old. Time for an update, then.
As you'd expect, the mark II models share many similarities with its forebear: most notably in the folding design that emulates a pair of sunglasses and makes them super portable. The build quality on the new design is noticeably improved with the set now possessing further rigidity and a comfortable fit. The design of the earpieces is also updated and looks less like plastic Kmart wheel rims and more like a Goth's orienteering compass. Lastly, the cable has also changed and is now single-sided and a little shorter.