No particular weight bias, so I'd avoid a group like the Assault Guards, Light Guards, or 1st Capellan Dragoons (which is a shame, their painst scheme is sweet), though the Heavy Guards could work, hey include some lighter elements. 1st Kathil Uhlans would be a good pick. They're black with gold trim, is gold too close to Yellow for you? The 1st Ceti Hussars feels like they'be your kind of unit, and they were on the JFOZ border for a while.