Note that you don't need an Inq. Lord, just an Inquisitor, (who does not need a retinue) to take an assassin. If you want cheap and have the elites slot to spare, just take an Inquisitor and drop a psycannon on him, have him hang out with a shooty squad if you have one.. that will only run you 50 points and give your squad a bit more firepower.
If you want a Lord, Go again with a psycannon, sage, mystic, and gunservitor with heavy bolter, which will run you 116, and give you a bit more firepower, with some bonuses.. and the psycannon and heavy bolter both have the same range when used as heavy weapons, which is nice.
I find DH Inquisitors do better as ranged assistance than they do in CC, but perhaps your experience differs.
If you want a Lord, Go again with a psycannon, sage, mystic, and gunservitor with heavy bolter, which will run you 116, and give you a bit more firepower, with some bonuses.. and the psycannon and heavy bolter both have the same range when used as heavy weapons, which is nice.
I find DH Inquisitors do better as ranged assistance than they do in CC, but perhaps your experience differs.