I'm in Canada, not Australia, but other than that very much in the same shoes as you. I really don't like Apple - how they lock you in to their way of doing things... I had an Ipod Touch as a gift, and although I loved the design, totally hated how Apple forces you to use iTunes and locks down everything to their way. I've used a fair share of notebooks in the office, and have always built my own PCs from parts, but when it came time to shop for my own notebook, I looked at Asus, HP, Dell, Sony, Acer, Toshiba, and Apple. Things that mattered to me were : great battery life, ability to play HD media, runs cool, long battery life, backlit keyboard, no keyboard flex, as much metal as possible on the chassis, as little plastic as possible on the chassis. Asus came very close, but it was missing the backlit keyboard, and at close to $1000, I was but $150 away from getting a Macbook Pro which had an-all metal body. So, in the end, that's what I bought.
To each his own, I guess.. Yes, there is an Apple tax to pay for the quality.. Yes, I really hate Apple.. but the Macbook Pro has all the criteria I wanted.. and is slim, and doesn't weigh 6.5 lbs.