ZippyPeanut :
Trend Micro Titanium with Malwarebytes as a passive secondary.
Unless Trend Micro has changed Titanium so it wont use a hole core at idle I would not recommend them. I had trend Micro before they switch over to Titanium and it was great. When they switched There program used Half of my CPU (50%) constantly and when I called and they saw the issue they could not fix it. I had to shut the Anti-virus off just to game. That year I was out $80 bucks (because of having 3 PC's) because they couldn't fix there goof.
Malwarebytes is good though I have used it off and on through the years.