I'm not very trusting of McAfee (which is what powers the Verizon Suite). Maybe it's gotten better (Norton has for example) but McAfee in my experience slows down your computer and does a bad job cathing viruses/Malware,
Avast (as mentioned before) is good but can be less than intuitive and can messup on cathing malware. Another good option is Microsoft Security Essentials (Yes, Microsoft!) which I've action seen beat Avast sometimes.