You may have picked up from my other posts, but I am a windows user looking to switch later on in the year. Are there any free to use/download, free to update and reliable virus checkers for macintosh? I have tried several sites and have only found norton updates. Also, if I am looking to buy in nov/december, would I be better to get a 14" ibook or a 12" powerbook considering I am a student with a budget of about AUD$3500. thanks alot.