Even though, it doesn't recognize newer threats that well, and after taking into consideration everything, I have decided to stay with NIS11. I was thinking of moving to F-Secure, but its heavy system impact made my decision in the end. It was very close in the end, but Norton's firewall is superb. There's no doubt about it. If the proactive detection improves in the near future, it's unbeatable.
Overall, NIS11 is still the best security suite out there.
Keep it up, Symantec!!!