If you start with DV AVI (or Quicktime), then use DV AVI (or Quicktime), in After Effects, why not just use the Render Que to produce a DV AVI (or Quicktime) to import back into your NLE?
Exporting DV to uncompressed really doesn’t serve a purpose. And exporting uncompressed doesn’t help fromj After Effects because your NLE will render it before exporting anyway.
Or, better yet, if you use Premiere Pro and After Effects, you can copy your footage to After Effects and then use Dynamic Link to link the AE comp back to the Premiere Pro sequence.