Grey Knights Strike Squad and Inquisitor upgrade choices

I picked up a box of Grey Knights, a codex, and an Emperors Champion/Crowe/Inquisitor and I was wondering about how I should upgrade them.
Should I give the Strike Squad a Psilencer, a Psycannon, or an Incenerator.
And I was wondering what some good ways to Equip the Inquisitor are, I have really only played a few practice games of 40k so I dont know what is good to play.
All advice appreciated

phsycannons pretty much seem the bees knees so far. As for inquisitors I don't know.

Psycannon only. As many as you can take.

Put your inquisitor in terminator armor and give them psycannons too. Let them ride in a chimera. Termie armor means they get four shots even if they moved.

I believe OX Inquisitors can take conversion beamers, something to consider taking the books overall lack of long range firepower into account. Although you can't go wrong with an OM Inq in TDA w/ a Psycannon.

As far as other units, only the FA GKs should have incinerators ever, and even then sometimes the Psycannon is still better.