My new iMac is arriving tomorrow. My first one. I am a PC guy that now just wants a machine that works. I connect to the internet via my wireless Linkysys router with 128 bit WEP. Assuming I need firewall software (ala ZoneAlarm), what is the best/most popular? I have heard of many Mac owners who don't even have software firewalls and that virus protection just isn't a big deal on a Mac. With the recent WSJ article on how Mac is outpacing PC growth, I can only wonder how many "new" viruses might end up approaching the Mac.. So bottom line question, do I need Firewall and/or Virus Protection software for my iMac? If so, what? Thanks!