Theme, theme, theme. It's a problem I'm having at the moment coming up with a Grey Knights list I'm happy with. While I love the concept of the EXTERMINATUS list, I don't have the Techmarine models to do it. I suppose I could proxy, but I'm not feeling it at the moment. I could run Draigowing (Draigo plus all or almost all Paladins), but that feels way too unwieldy and slow. I'd like to do a Purifiers army, but I'm not sure about Castellan Crowe. Perhaps I could do a general mix of Terminators, Strike Squads, and Interceptors.