Without wanting to put a spanner in the works, and I agree with Et Voila, about wisely spending cash on food and drink instead. I've got 10.2.8 running Norton AV without any issues. There are a few Mac viruses and trojans out there in cyber world but none to ever get excited about. In my time with Limewire (over a year) Norton has reported a PC Virus and a PC Trojan embedded in shared music files. Ah, those poor PC users. Norton was able to quarantine and delete them. Not that it had the slightest effect on my machine before it did this. It's piece of mind because we're not talking about just Limewire. We're talking about anything you install on your mac that is not via the 'software update' utility.