Thinking too much

You ever get into a train of thought that leads you into redesigning large chunks of the system? It's very dangerous and I'm trying to keep it in check. I am of two minds - The first is to keep it similar enough to d20 so as not to turn off those consumers; the second is not to try and out-D&D D&D. I mean, I want something simple and easy to use that keeps the strong gamist and narrative elements that I like in my game.