Grandma Sue, the best security suite is the one that matches your needs. My best would not be your best, so there is no one best. If you like Norton IS, perhaps you should stick with it but it certainly is expensive.
Most of the well known security suites cost money. These "suites" have pros and cons. Pros: user friendly, complete, and consistent. Cons: expensive, bloated, slow, and difficult to micromanage. Your typical geek might not like such a suite, but your typical grandma probably would. Some geeks put together various different packages, especially free ones, to create the equivalent of a suite. But that takes more time and knowledge.
Another potential problem with security suites is that some users get a false sense of security. They come to believe that this jack-of-all-trades software makes them invulnerable to attack, infection, or identity theft, but it does not. By the way, what makes you think that "Identity Safe" is a must have feature?