A user reported that the 15% off deal was expired last week, however a 10% code is still available. Since they didn't post it I thought I'd do so now, thanks to OzBargain user Bronwyn Bishop.
SCTI always provide competitive quotes and have a very good reputation from what I've read. 10% seems to be the best discount available at the moment, as always shop around and compare before committing. The TID 10% off deal might be worth checking out also.
Serious question (and thanks to OP for the deal) but is there any reason why you wouldn't use the travel insurance provided by your credit card?
I recently went through a MASSIVE ordeal where my brother was traveling in South America, and his my travel insurer (ANZ via QBE) spent what was close to $110,000AUD with medical and transport costs.