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Having played pure Grey Knights I am thinking of creating the Exorcist Chapter at the time of its creation. The fluff (what there is) says that the Exorcists were sent to fight on a Daemon world on the northern edge of the Eye of Terror, backed up by a company of Grey Knights should the 'experiment' go wrong.
So, I'm thinking of Space Marines with allied Daemonhunters.
The Space Marine (Exorcist) part will comprise of a Librarian and Chaplain (to tend for the spiritual/psychic needs of the army). The Chaplain will be seconded from the Inquisition. Then some tactical squads probably in rhinos with a bit of heavy support.
The Grey Knights part will consist of a Brother Captain and squad of Terminators (maybe deep striking), a large sqaud of Grey Knights as a fast attack choice (both of these fluff wise allows them to teleport to trouble spots if the experiment goes wrong).
Then a couple of smaller Grey Knight troops choices to be on the ground to observe the action and assist if needed.
Let me know what you think.
The new blood angels may be what you are looking for - the exorcist space marines were meant to be more aggressive than regular codex marines.