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If I want to make say, a Vostroyan IG army but which is led by an Inquistor Lord and has an Assassin and some Grey Knights, would that be possible?
If so, what Codex(s) should I buy? Only one?
there are a few threads out there discussing the various ways to use both IG with Allied Inquisition, and Inquisition with inducted IG.
the best outline of the rules is here:
the DH community did a smash up job of compiling info on this.
but to get to the base of your question, You should buy both the DemonHunter codex and the Imperial Guard codex.
the DH codex outlines the rules for allies and induction. You can use Vostroyan models for either.