Ok, so here's the situation. My inquisitor and her acolytes have been sent into Tau space to infiltrate the Tau underworld (criminals, revolutionaries, etc) and encourage a rebellion while they wait for the crusade forces to arrive. Well, they'll meet up with the existing underground, join them and generally go about their mission. However, two of the npc acolytes are engaged, and when the crusade forces arrive want to squeeze in their wedding before the revolution begins.
Well, the inquisitor will go to marry them, but as would be expected of a 40k wedding, it will be crashed, by an Imperial kill team. See the High Inquisitor of the crusade sent my inquisitor behind enemy lines presumably to get her out of his hair. However, seeing her as a threat to the crusade's ongoing progress, while she's gone, he excommunicates her, and sends a kill team to assassinate her and her acolytes.
The question I have, is what form of kill team should I have attack the wedding? Should it be Inquisitorial Storm Troopers, Sisters of Battles (he is a Hereticus inquisitor), a nice squad of space marines, or just straight Imperial Guardsmen a la Guant's Ghosts. It should be noted however, that my players are around 5th rank, and have proven rather battlecapable in the past, having killed a rogue space wolf, several big Tyranids, and some nasty mutants to book. What do you guys think?