I am a firm believer in Norton's 360. As either Staples or Office Depot has it on sale for very little (sometimes free) and it's good for up to 3 computers, I've using it for about 3 years now. Love it.
Norton hit a real rough spot in the road a few years back but they've really got a good product now. #1 seller this past year! + they have a great customer support.
Comcrap gives you for free when you get their internet access Norton Security Suite and Norton Internet Security for Mac. It works very well and it is not the performance hog it once was.