I'm using heavy metal battle armor for the most part. Megamek lab can also do battle armor.
Medium.
3 walk, 10 standard armor, AP Gauss rifle, aSRM-2 with 4 salvos. Magnetic Clamps. (Anything the IS can do... the clans can copy quickly once they hear about it.) Heavy Battle claw.
Nearly the same mobility as elementals. Flexibility was traded for streamlined production with the AP guass, Advanced SRM's give better range and hit accuracy compared to the elementals SRM. Deeper ammo bins lets you keep firing longer then a normal elemental. The Magnetic Clamps lets this battle armor design mechanize with vehicles in their trey. The Heavy Battleclaw is mostly there to show that society elementals are better endowed then their clan counterparts.
Assault
1 mp, 18 armor, Modular missile capable mounts in the arms and the body. 820kg available for dakka.
Such interesting things as:
LRM-4 with 8 salvos', 2 AP gauss rifles.
3 SRM-4's with 3 or so salvo's each.
ERMedium laser With Shots for Days
1 Heavy Flamers, an ER Small Laser, And a machine gun or light missile launcher or something.
Nothing super interesting really.