Errex, samurai armour was any color under the rainbow. But for the most part, depending on the period, the major elements (the breast-plate, the helmet, gauntlets, leggings) were black, red, or varying shades of dark blue. The lacing and under-garments were, like I say, any and every color you can imagine, very ornate. A fully-armoured samurai was, in my opinion, one of the most breath-taking figures in medieval history.
If either of you need reference material on the subject, an excellent one is a book called "The Samurai - Recreated in color photographs" By Mitsuo & Ghislaine Kruit, published by Europa Militaria.
Which models do you have to paint, yet? Any 120mm? I'm always on the look out for nice 120mm samurai stuff.