I'll vote for White 16 as well. I just looked at the current selection of skins; 1/2 (5 of 10) of the P-40Ns have plain white tails. The blue diamond pattern is more visually interesting and sets it apart from the current lineup.
Of course, any of the 3 would be great additions.
Eventually I'll be doing all 3. This thread is just to decide which will be first. I also plan on doing N's from the MTO, CBI, and Russia.