After trying h264/263/animation/jpeg/jpeg2000/uncompressed etc....
I just wanted to share that I have found reasonably good results
using apple's intermediate codec for playing back 1080i 30fps quicktime movs with quicktime pro on a 1.66Ghz Intel Core Duo Mac mini.
Unfortunately the mini will not allow 1080p as the comp was rendered in AE due to the graphics card, but it still works well for a nice looking trade show loop on a 47" sharp LCD.
The file sizes are quite large but not prohibitive for say a 20min tradeshow loop.
Eventually HDdvd or bluray will be a good option but for now this seems to be a resonably affordable solution.