Nice find, prices of games in Australia are really expensive, the cheapest you could find this game in a retail store would probably be about $50 (It was $110 when it first came out).
I don't like the Recon class as im not that great with sniper rifles. I use the assault class mostly but playing as Medic can lead to some hefty amount of points, you get 10 points i think for reviving someone at at certain times it can be quite beneficial to have a medic.