hi nine9s,
Best way to see if avast! Pro meets your needs is to trial it for thirty days. You can always go back to the free version at any time.
Note: Do not use System Restore to remove the trial version as avast! self-defense module does not like to be switched back to an older (not the current environment) and a restore will likely result in a dead a/v until repaired. Workaround for that, if you really must, is to disable self-defense first, and then do the restore. Reboot and then re-enable the self-defense module.
Preferred method is to uninstall, reboot, install the version you want, reboot, register. This way all files related to the pro version are removed.