Our use of Coinbase in Australia is limited to BTC only and very restrictive and difficult to fufil identity verification so once I managed to get on a more local exchange (BTCMarkets) the ability to get fiat to the market improved considerably.
I wrote a post the other day about the frustration of over stretching your available cash. I didn't delve into specifics of exchanges as I figured if any Australians wanted to pursue me for details they would, note I'm assuming most of the audience here is in the US or Asia.
In this case it was more about spending my cash as another payment was due, that payment ended up delayed and I was hamstrung while the prices dropped again. I'm back to normal this week and thankfully the prices didn't correct too much over the weekend.