Avast is the only good AV IMO - other free ones tend to have vital bits missing.
Good anti-malware - Malwarebytes and Spybot S&D
Good Firewall - Comodo and Sunbelt.
Comodo free Security Suite looks promising, but is a bit of an unknown quantity as yet (to me).
My view is that paying gets you superior protection, and in terms of paying for a computer and a broadband connection is nothing much to get good protection. I use Eset Security Suite.