Avira is the best free one. I think the best paid for one is NOD32 and Kapersky.
I think that Kaspersky is based on NOD32 (or the other way round) so they're very similar in performance.

I personally don't think the payware offer enough over and above the freeware, particularly Avira. If you want some proof, check this out.....
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It only supplies real time scanning not on-demand.
are you 100% sure?
i installed it on my laptop because it's not a realtime scanner
nod32 or kaspersky if you want to pay
i've setup nod32 for a few businesses, i get zero hassle from it and every symantec system it's replacd, it's picked up tons of junk that symantec missed
