Or just chop and paste one of the new models, those are quite nice.
If you have a death company unit, then you dont want the chaplain to be anywhere but an inch away, so however they are equipped, go with that.
Special characters arent all that much extra to things, and a chaplain with a jump pack is much the same no matter what hes dressed up as.
I personally would take the one with the power fist and outstretched arms, but Im big on lots of powerfists on close combat squads.