Jessie's right, it's really hard to declare a "perfect" cookie because so many factors play into it.
I prefer chewy, while others prefer crunchy. Some people like nuts, others do not. Etc.
As far as chocolate chip cookies go, well, my mom makes the best ones, but she just follows the directions on the Toll House chocolate chips package. Somehow, though, when she makes them, they're better than any other.
That said, I've baked a lot of cookies in my life. One winter, in fact, I baked about 80 different kinds. Of those 80, there are two that I still make on a regular basis, years later, because they're so goddamn good. They're both Martha Stewart recipes.
1. Striped ice box cookies (a thin and crisp cornmeal cookie layered with chewy cherry filling).
2. Peanut butter-chocolate chip oatmeal cookies (another crispy cookie, with a slightly chewey texture when done right--don't overbake--and TONS of flavor.)
If I were you, I would definitely put those on your list for this winter's baking. And you could even make the PB/chocolate chip ones that much more decadent by using a mixture of dark muscovado/light brown sugar in place of the brown sugar.