I currently play a pure GK force, but I am thinking of adding some inquisitors to spice up the appearance of my army (tired of painting in Boltgun Metal), and to counter some of its weaknesses, primarily lack of anti-heavy infantry and anti-tank firepower. Here are two inquisitors to answer those questions. The points values may be a little off, I am going by memory.
Inquisitor Lord w/ master-crafted plasma pistol, daemonhammer, refractor field
3 Guard Veterans w/ plasma guns
2 Sages
3 Acolytes w/ plasma pistols
3 Familiars
Chimera w/ heavy bolter, heavy bolter, extra armour
Total: 377 pts
Advancing in the Chimera, this unit can pour out 7 AP2 shots at 12" after disembarking, and potentially many more if they get a chance to remain stationary for a turn. The unit is more expensive than a 10-man GK squad, so it might be worth cutting down to a normal inquisitor and getting rid of the acolytes' plasma pistols and the inquisitor's daemonhammer.
Inquisitor w/ bolt pistol, eviscerator, refractor field
3 Guard Veterans w/ melta guns
3 Acolytes w/ melta bombs, storm shields
Rhino w/ extra armour
Total: 255 pts
Clearly this unit is meant to hunt vehicles at close range. The acolytes are given storm shields in the event that this unit assaults a dreadnought, to keep the inquisitor alive long enough to get 2-3 attacks with the eviscerator. An alternative is to give the inquisitor Terminator armour, chainfist, bolter-meltagun, drop an acolyte, add a sage (so the inquisitor's one melta shot per game is at BS 5), and replace the Rhino with a Chimera.
Do other people have different ideas for inquisitor retinues along these lines? Usually I see the CC inquisitor + retinue, or an inquisitor with a psycannon, 3 gun-servitors, 2 sages, and a mystic. Are these retinues too expensive for what they are intended to do? Can I make them smaller and still have them accomplish their goal?