For someone like this, I agree. I recently recommended a Mac to my eighty five year old uncle.
For the vast majority of people, though, including neophytes with no interest in computers, I'd recommend a PC. Simply install continuously running anti-virus and anti-spyware programs, turn on the Windows pop-up blocker, and use a hardware firewall. Total cost, maybe $150., still cheaper than a Mac and you have a faster, more versatile and more compatible machine.
Again why? Most computer users want to surf the web, get email, and do a few other things like word processing. Unless you are totally a game nerd, then a Mac can do those better and safer. More and more games are coming for the Mac as well.
As to cost, save the $150, apply it to a Mac Mini... and not worry about spyware, viruses, worms, pop-ups and other mal-ware.