Robin,
My choices would be these :
1/35 - Tamiya's plastic samurai. Great, inexpensive practice kits.
54mm - Benieto's mounted samurai. Love the pose.
70-80mm - Fusilier's German Infantryman, Verdun 1916. All the horrors of trench warfare.
90mm - Pegaso's Ashigaru arquebusier...