I wanna know each note and harmony I play. That is why I'm gonna learn a WHOLE Bach fugue by memory (C major book 1) but it is gonna take a while.
Might I suggest the C minor book I fugue instead? It's a classic fugue and the benefits of learning it in the way you want to are immense. It is a "perfect" fugue in that it is structured exactly according to the "rules" of fugue-writing. On top of that I found it a whole heck of a lot of fun to play.