I stumbled across an old article from the beginning of this year which wrote about a sister of battle tabletop army that (legally) incorporated Grey Knight units into it.

http://www.3plusplus.net/2013/01/guest-article-accounts-of-a-sister-of-battle-with-grey-knights/#more-3779
I also got to thinking about the focus of grey knights (on tons of similar melee units with very few potential vehicles and a limited range) and I realized that since it is both reasonable in fluff (you know me) and in practice for Grey knights and Sisters of battle to be deployed together, (and since there is like a <10% chance of Sisters being an independent race in elite mod... ever) I think that Sisters of battle ranged squads and vehicles can be added to Grey Knights to augment their melee focus and currently limited T2 and T3.
Although I'm not gonna dive into unit theory crafting because I feel like I'll only end up limiting the discussion, I feel like this is something cool to consider and would offer a lot of possible potential.









