Welcome matey to Aussie Pinball.
It all depends on what u want to spend on your first pinball machine.
You can spend around the $2500 mark and get a nice mid 1990's machine which will be alot of fun, or you can buy a brand new Stern for $6600 and u have a choice out of quite a few great titles, including AC/DC, X Men, Avengers etc.
http://www.sternpinball.com/Games.aspxIt all depoends on what u want to do. If u do buy a 2nd hand machine, just make sure you buy one from a collector and u might pay a little extra, but you should get a game without faults/painfull fault finding. Also, ask about members who live close to you, cause sometime the best way to get a feel for the hobby is to meet other like minded people close to home.
Welcome to Aussie Pinball, alot of top blokes on here.