Agreed 100% Avast.For me, personally, It would beYou must be registered for see links, it doesn't spam you with notices, and nor does it block every single site, you should try it.
Always treated me right i used that also(~`,`) As of now I never tried Avast, but don't use AVG, it sends false reports.
I'll go for Microsoft Security Essentials (if you're using Windows anyway, eh) They have their virus definitions in their website.
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Those are the screenshots from the user interface + more information page. The notices appear at the lower right edge of your screen. However, I believe it doesn't protect you from malicious links.