Inquisitor (20) with:

Equipment:
Psycannon (30), close combat weapon (1)

Psychic Powers:
None

Henchmen:
2 Sages (20), 1 Mystic (6), 3 Warriors (30): 1 Gun-Servitor with Plasma Cannon (35), 2 Imperial Guard Veterans with plasma guns (20)

Cost: 147 points

Abilities:
Lots and lots of AP2 death, and as many as six plasma shots at short range plus the plasma cannon's blast marker. All hit on 3+ or better (the Inquisitor has a BS of 5 because of the Sages) and when the inevitable 1 shows up, the Sages allow a re-roll to lessen misfire chances and garner more hits. If daemons or Deep Striking units enter play within 4D6 inches the unit gets to fire a free round of shots at them. Problem solved!

Tactics:
Keep relatively near the back of the Daemonhunters force. If Grey Knights are present and they wipe out a Daemon pack, your opponent will attempt to assault this nice juicy unit by entering play at the back of your lines, at which point the Mystic allows it to turn round and give it a massive volley of plasma which you can then repeat in your own Shooting phase. if there are any daemons left.