If you want to get a feel for the top AVs, check out the work of the independent AV Comparitives, good stuff. http://www.av-comparatives.org/
Kaspersky's really good. I found it was a tad heavy of resources though, and it didnt play well with certain things.
Currently I put NOD32 on everything. I find its really effective and its detection is great. I can speak for their suite though , I've never used it.
Penewah!
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