Best rated/preferred Dropshipping module(s)

[Faylon]

Hello everyone,

I have gone over pretty much many modules within and outside of prestashop.com .  Picking a module to go with is very hard to determine from the outside looking in.

I was hopeing that perhaps you all can inform me on the best dropshipping modules that you know by knowledge. (built nicely and not just thrown together).

I would need it to atleast handle most or all of the following, and more if possible:

-multiple suppliers
-multiple carriers
-returns
-email or ftp new orders in required format/ file type
-fully automated
-user friendly administrative system
-seperate admin/sub admin logins
 
please provide links to them.


Thank you all.