Hi Chris,
You'll need to search eBay for iLife 09 at the latest...
iLife '09 System Requirements...
Hardware
- Mac computer with an Intel, PowerPC G5, or PowerPC G4 (867MHz or faster) processor.
- iMovie requires an Intel-based Mac, Power Mac G5 (dual 2.0GHz or faster), or iMac G5 (1.9GHz or faster).
- GarageBand Learn to Play requires an Intel-based Mac with a dual-core processor or better.
- 512MB of RAM; 1GB recommended. High-definition video requires at least 1GB of RAM.
- Approximately 4GB of available disk space.
- DVD drive required for installation.
Software
- Mac OS X v10.5.6 or later.
- QuickTime 7.5.5 or later (included).
Additional Requirements
AVCHD video requires a Mac with an Intel Core Duo processor or better. Visit iMovie ’09 Camcorder Support for details on digital video device and format support.
http://support.apple.com/kb/HT3876
http://en.wikipedia.org/wiki/IMovie#iMovie_.2709
That said, iMovie 6HD was far better than iMovie 08. 🙂