When I was planning my Daemonhunters army, I wanted a sniper. However I didn’t really like the Vindicare model, so decided to order the Imperial Guard Catachan Jungle Fighter Sniper and use that as a Vindicare Assassin with Exitus Rifle.
I have to say, when I compared the model to the Cadian Kasrkin I used for the Inquisitorial Stormtroopers I was slightly disappointed. It lacked the finesse and quality of the Kasrkin models. If I was going to start again, I would probably use the Cadian Sniper models.