Exorcists

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The Exorcists are essentially Grey Knights if they were actually practical.

Grey Knights	Exorcists
Recruit from Pskyers, who are pretty much Daemon-chow	Recruits are possessed and exorcised of Daemons, making them invisible to Daemons.
Kills or mindwipes everyone who sees them	Doesn't murder innocent civilians for being saved by them
Recruits from an already rare population and only 1 in a billion survive	Recruits from an entire planet, and two scout companies offset the lethality of Daemonic Possession Therapy
Only fights Daemons	Actually fights non-Chaos enemies on a regular basis
Secret base is in one of the most overpopulated solar systems in the Imperium	Secret base is in the middle of a forbidden sector