Since the Aussie dollar is almost at parity with the US dollar, if I only had to pay $250 US for the thing, I'd be very happy. I paid $230 or $240 AU for my DSi, and thought it was a pretty good deal at the time. Even $300 AU would seem perfectly reasonable. The DSi XL's RRP is still $300.
If they price it above $300, I will whinge and sulk and wait for a good sale price. (If I were a betting woman, this is the outcome I would put my money on. Oh well. Still plenty of excellent DS games I haven't got around to playing...)