Editing Software for New Film

Once again I am going to use iMovie for editing my footage. Eventhough my new film will contain many more instances where some sort of effect will be put into a scene, I have gone through the capabalities of iMovie's editing programmes and found them to include all the things I need. These include turning shots into grey-scale, putting more than one soundtrack over each other, shot transitions such as fades, and putting titles over shots. Also the ability to take sound from iTunes is in iMovie which I think I will need at some point, eventhough iMovie has a good amount of sound effects already in the software. Because I used iMovie editing together the last movie, I feel I have used it enough to be comfortable using these more advanced features of iMovie.