Bradley and Herrera at the moment are high quality lighter hitters that'll come forward. Although most peoples' blinders and emotions will say otherwise; Andre Ward may be the best at it when he chooses to do so.
Josh Warrington is a good example of someone coming through who is all about pressure without being able to punch although I can't see him getting to world level. Bradley, Herra, Ward are all top drawer examples I guess.
Jung Koo Chang was supurb while Kalule and Ouma deserve shouts. Varying degrees of power but none of the were knockout hitters. Mikhaylenko impressed me in his last fight and fits the mold.