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What Malware, Virus Scanner do you use on your Pro?

Windows Defender that comes with Windows 8 is sufficient for me. I have multiple virtual machines so I run all new programs in there first before onto my host PC.
If you are "discerning" about your web surfing habits, then I've found Microsoft's Security Essentials to be a decent enough antivirus, and it's free. I put Nod32 on machines where the users are a bit more clueless.

I've had great success with Malwarebytes for dealing with malware-specific problems, as opposed to virus.

I bet it won't be long, if we're not there already, before you really can't make a differentiation between malware and virus.