|Getting a free antivirus is better than paid. For example if you use AVG Free and you want anti-rootkit which AVG Free don't provide, you can use google search for free rootkit protection. When you search for a software which only know how to do rootkit protection, there is a higher chance that the product will be much better than AVG paid products. But be careful when you use Google search as some of them may be fake software and may turn up to be viruses.|
So lets come to the real thing, you should not buy paid antivirus. Avast! Free is the best antivirus. It have the minimum protection that other company paid antivirus already have. avast! Free only have AutoSandBox right. So if you want a better sandbox, use SafeSpace Free Edition. Looking for a good Firewall? Use ZoneAlarm Free. Among all the firewall, Windows Firewall is the worse one.
The worse antivirus is NOT Norton. It's AVG. I've experience with AVG. It has the worse virus definition and make so much mistake that it even delete my confidental documents.
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I understand that the topic is only about suggesting a good antivirus, but I am giving more since you are requesting for complete internet security and more.