Everything in iLife can be replaced by other programs. Only buy it if you want vanilla programs. iDVD is a simple DVD creation software, iPhone is a simple photo organization program, Garage Band is a simple, easy to use, audio creation and editing software, and iMovie is a simple video editing software. If you want just one of those features, invest in the professional or advanced versions. I am a bit biased since my computer can't run half the software. I'd like to see Apple release each application seperately for those in a position similar to mine.
TEG