To me, this is the hidden gem. Yes it is China brand anti virus. The one that is notorious for being installed with adware. But that is the chinese version. This one is the international version.

http://www.360totalsecurity.com/en/

Been using 6 months now and is really reliable. You can choose to use its default 360 scan engine or Bitdefender or Avira engines that can be downloaded after installation.

Not many will use that exception feature. Only people that runs a lot of legacy, custom or *ahem* software would look at 360 seem inadequate. For some users, it is actually too strong much like Avira was 5 years ago due to false positive. I was an Avast user for 2 years. But since found 360, no turning back already.