Only do so if you want to take your army in that direction (fluff-wise), and if you think that some DHs would complement your army in some way.
I am considering getting an Inquisitor and Friends to add to my army to put a bit more hand to hand punch to my army, and because I don't dislike the idea that an inquisitor could use my soldiers to exterminate some filthy chaos scum.
In regard to the assassin, you don't need the Daemonhunter units for those, since they come in their own seperate codex that does not require Inquisitors like a DH army does. Just because you have some DH in your army doesn't subject it to DH rules, (so long as it is, in fact, an IG army.)
Having a group of Grey Knights to teleport into battle, (Fast Attack choice, in that case,) wouldn't be too bad a choice.
I've yet to read the Stormtroopers in the new IG, (if they're even still there,) but DH Stormtroopers are both flexible in numbers, (5-10,) and pretty cheap at 10 points a pop, (considering they have hellguns, targeters and frag grenades by default already.)
As for a nasty HtH unit, look no further than the Grey Knight Grand Master Hero with a retinue of 3-9 Termies... that is, if you're ok with dropping 283-559 points on a single addition HQ unit, (that's not including any upgrades or additional wargear.)
AKA DH is expensive.... as hell. Whether or not you want to mix them up in your IG army depends on whether or not you're ok with dropping 25 points on a Space Marine cuz he has a storm bolter and a nemesis force weapon.
their Terminators are great at killing nercons and marines and most importantly capturing objectives/ table corners. Agianst neckys they get 3+ 2+ no sav, no we well be back. They can alway telaport no matter what game ur playing which kicks ass.
god sake i didnt know that was copyright stuff it was only 2 numbers i wanted 2 know im new 2 this u know i dont know the rules and if everyones like u i dont wanna learn any rules go ahead report me i dont care your all a bunch of 8teen year olds playing with little plastic men im only 10
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