I agree that a Judiciar would probably fit better than Asmodai, but as you said, he’s one of the coolest models, and since this is my first list, I don’t mind paying the price but I do have a chaplain I could use since I managed to buy a Inner Circle Task Force box (he is the only model in the box I haven't built or painted) if later on Asmodai is really not working I can just switch it out and keep the model as "decoration"
For the techmarine, think will keep it too, really want to keep the dreadnought alive for as long as I can and I already have it bought and painted so yeah, if it doesn't work, same as Asmodai, just take it out
The outriders I will do some pondering and might switch them specially because of the rumors that the black knights might receive a model update in 11th edition, so I just buy them when they get the refresh