Spear always looks good when big guys completely demolish Nunzio-sized wrestlers. Of course the downside is Ryback would be an even more obvious Goldberg rip-off than he already is. In that case, a clothesline could work fine but he needs to tune it up a bit to make it seem more impactful.
I would like to see him use an delayed suplex rather than his current finisher, perhaps have him fall forward instead of backwards as to "face plant" the opponent. It would look a little more technical and impressive then lifting into a shoulder carry.
As for a strike/non lifting grapple move as a backup for incase he's fighting someone who weighs more than 2 local jobbers, then I don't remember the name of it but it starts of similar to the rock bottom where you hook your arm around his neck and shoulder but from there you kind of "trip" the opponent forward and you fall back with him I believe he could make this look reasonably nasty.
(Both these manoeuvres feature his opponent "eating" the mat.
Edit i guess it would probably be called a reverse STO?