DV AVI for DVD's, and online broadcast (like an iTV or something) and use DivX, WMV, Xvid, or MPG for your smaller file conversion. If possible, get a hold of Cleaner XL. Awesome program, and cleans up clips nicely.
I normally code all mine in DivX. Tried different formats for quality, file size, and ease of use. I prefer DivX for mine. A lot of people use various kinds for any number of reasons. Find which is best for you, and to your liking in quality and size, and stick with it.
