my first choice would be a SPAD XII, but i'd be content with a XIII.
Hanriot HD.1/2..
OEFFAG Albatros...
Breguet 14
Star Strutter....
1 1/2 Strutter....
Ilya Mouromets!
all 1/32, i don't have any opinion on 1/48 since i will never buy anything in that scale. Some of these seem likely for WNW to do but the Nieuport shows that Copper State have nothing to fear. between Copper State and WNW, i'd buy whoever's gets released first. and in most cases, multiples. (not the Ilya Mouromets, i gotta save some space in case someone releases a Zeppelin-Staaken...