Just something unrelated: whatever antivirus you choose, stay away from top 3 sellers: McAfee, Symantec, and Trend Micro. Malware authors test their work with the most prevalent antivirus software, that is why hit rate of popular antivirus software with new variations of malware is abysmal. So, as a rule, antivirus quality has little to do with the quality of actual engine.
Also, mkreku, a chart about NOD32's performance taken from NOD32's website is not really indicative of its quality.