Mine are 900 MB to 1.2 GB each, but I use the same format for my iPod as I do for my xbox360. I am running out of HDD space (and I have 500 gigs...), I can't afford to have two to three formats of each video lying around. As long as you are syncing relatively often, something around that is fine. I can fit usually 4 shows and 3 movies, along with some podcasts and a good amount of my music. Two movies taking up 2.78 GB is pretty high, though...