I came across this unit by chance while looking to replace the ol' faithful Pioneer DEH-P3550MP, which served me well for many years.
I was unable to beat this price and thought I'd share with the OzBargain-ists.
Tech specs can be found here: http://www.sony.com.au/product/mex-bt3750u
The next best price I could find was ryda.com.au for $327.85 + $16.30 postage. JBHifi had this unit on sale for $208 + about $12 postage (online), but this deal ended April 21st. They now have it for over $500!
For the features it has, $279 seemed like a bargain. Not only does it have Bluetooth for the phone calls, but it will stream music via bluetooth as well.