I'm completely the same as you so I did the following: I took the $10 plan and watched my usage for a week. I seem to hover roughly at about 30-40 searches per day on average so I upgraded to the Family plan. Yes, I know, it sounds weird but now I've got 1400 searches and just didn't invite anyone. And I don't have to worry about if it's going to be enough because my own data says that it's going to easily be enough.

Lenses are actually why I subscribed mostly. I search for organic data often while trying to find help for a product or the opinions on a service or something like that. Regular search is ok, changing to the Forum Lense is mind blowing because I only get discussions from real people.