Depends on the physical resolution of the clips.
Also consider that .avi, .mov and .mpg are only file formats, meaning they are a container for video and audio encoded with different codecs like Xvid, H264, ProRes, MPEG-2, ....
I would go with .mov encoded with the Apple DV codec, or with .dv, which is obviously the DV codec.
Also know that using the DV codec will take 3.125MB/s to store the video, but it will be better for editing as highly compressed video using Xvid/Divx or H264 or .... is not suited for editing, only for distribution.