I think you got it right. Just of course make sure its 1280 x 720p in the size ratio, some of the videos on the quicktime site are different aspect ratios as well, so some are 1287 x 643 and other wierd numbers because of how they were shot i guess. BUt HVX footage should be 1280 x 720 obviously.
Make sure you have your audio as AAC , to save space there and keep audio quality. YOu know you have it right when 1 minute of 720p trailer video equals about 40 - 50 megs