The Telex seem to be a very reputable headset. Made in the US and Telex seem to have a $50USD rebate going (not sure if its available for Oz customers though - I might shoot them an email).
There is also a 30XT version of the Stratus series (has the features of the 50-D except for the Electronic Noise Reduction) for $200 cheaper however it does not appear to be available in Oz (there is is 30 non XT however it does not have the features available on the 50-D as I think its an older model).
Some interesting comparisons between the ANR headsets that i've come across (worth a read if your looking at buying):
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http://www.audacitymodels.com/whitepapers/headsets.pdf (detailed comparison)
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http://forums.jetcareers.com/general...-headsets.html (in particular a v.good post half way down page)
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http://www.matronics.com/archive/arc....digest.vol-pf (you will need to CTRL-F to find the term "telex" as posts seems to be all over the place, however it offers some more comparisons)
Looks like there will be some interesting headset features coming out in the next few years. Wireless headsets using Bluetooth to remove the wires being one.
Cheers
Tim