Here's one for the U-96 (http://www.aircraftresourcecenter.com/Gal6/5601-5700/gal5678_U-boat_Schlosser/02.jpg)

Then everything you wanted to know about U-Boats (including the emblems): http://www.uboataces.com/ref-insignia.shtml

But, if I had to make a choice, I'd like to see the markings for U-47 (Gunther Prien's boat - Scapa Flow),  the U-96, and some others.

OT...you offer a Japanese submarine in the 3D studio format, is there ANY way you could be convinced to offer it in a Poser format?  (I for one, would love it). Also, what about something like this (http://www.combinedfleet.com/sen_toku.htm)