I was also poking around the GW online store this morning and was struck by how well some of the Necromunda minis would work (although they're "heroic" 28mm and may not jive exactly with IK's 30mm. How well do Warmachine minis look next to say Reaper minis?) although you've gotta be picky as some are definately futuristic. Others, however, look made for steampunk. Also, if you're not scared to do some minor conversions, they come with weapons blisters so you can make sure you get shotguns, autoguns and bolters, which all look reasonably steampunky, as opposed to plasma pistols or lasguns, for instance.