Which antivirus is better?

Hi im looking for a good antivirus. Which one is better Avg or Avira or Avast. I want a antivirus that has everything in it (antispyware, firewall, antimalware, online scanner, email scanner, rootkit protection, and can heal files and kill viruses quick! Also i want a antivirus that will not make my computer slow and i wont have to download other antivirus with a detection rate of 82% and up! thanks!