Gloria Gast's Poser Junction has some great Egyptian god characters that, with metallic textures on their heads, would probably make great Jaffa troops. The clothing might be suitable as Goa'uld costumes, also.

Stargate Command uniforms are just army combat uniforms, aren't they? Aside from the SGC patches, there should be little difference. Have you seen PhilC's Army BDU's in the Marketplace?