I don't know what the Austalian price will be. The retail price for the body in the US is US$999 and with the 18-135 lens US$1299. The price will drop rapidly once they've been out for a while and assuming Nikon can keep up with production. I paid $1400 for the D50 nearly 12 months ago and I wouldn't pay more than $1000 today.
The 18-200 VR lens is about $1200. It's an excellent value walk-around lens.