I've dealt with both OSE and Finedesign. Both have been good to me. But OSE has faster shipping and Steve responds very quickly to emails.
The Feigao and the Nemesis are the same motor. But I bet a Neu would kick some (can't curse) chickens out the way! The lipos on battlepacks look pretty good and ya can't beat the price. I just ordered some more today. You want to get your packs in 2s1p configuration. In that way you will have more choices for battery position and weight distribution. I haven't used the Etti's yet. I've been looking at them. From what I've seen and in the near price range, go with a Castle Hydra.