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If you can go to 25mm metal, I'd recommend the GZG Stargrunt miniatures. They have a nice range of troops with some powered armour as well... you may even find some clan battle armour in there if you look hard enough... https://shop.groundzerogames.co.uk/25mm-stargrunt.htmlThere's Maelstrom's Edge in 28mm: https://www.maelstromsedge.com/medge/store.jsp
Sadly Anvil Miniatures Afterlife range is being phased out. There is a notice on their web page that they will be redesigned to be more compatible with the Regiments range, which I have mixed feelings about really.