In case you missed the deal a couple of weeks ago from Amazon.uk, Amazon.fr is offering these for 148.78 EUR delivered to Australia (approx AUD 186).
Definitely a great set of open headphones, doesn't require as much amping as the HD650 - but nevertheless produces an astonishing amount of detail and clarity.
Here are some reviews:
http://www.head-fi.org/products/sennheiser-hd-598/reviews
http://www.headphoneinfo.com/content/Sennheiser-HD-598-Over-…
PS: I found this whilst checking my order on the HD 650s bought last week from ozbargain. These were the first cans I clicked on and it turned out to be quite cheap, as these sell for around $240-$250 on ebay. I'll add more to this thread if I happen to find any more. Enjoy!
EDIT: Sennheiser HD600s for AUD 298, not the best deal, but thought I'd include it anyway: http://www.amazon.fr/Sennheiser-HD600-casque-ouvert-hifi/dp/…
Great price - just ordered a pair of these at this price. I've been poking around on Amazon and eBay all morning looking at these guys as compared to the AKG 701s and a few other comparable phones. Certainly at under 200 including shipping this is at least 20 clams cheaper than any other offer available.