Well done on taking on such an ambitious concept! Using HD, especially the cheap HD the iPhone camera provides, to create the incredibly rich visual style of those movies (yeah, I'm a fan too) is going to be tough if not impossible. As a post guy, I would recommend you study as much colorist technique as possible, and then just practice like a beast.
Good luck working with the two apps you listed, but I can assure you that you need a professional setup like Adobe CS or Avid to do what you're talking about. Both are impossible to buy, but you can rent them as long as you need them ($50 or $40 monthly, respectively). I'll leave it to those with more expertise on the matter of selecting a film quality HD camera to expound on that.