The closest guys right now that will always guarantee you an action fight/will not dance around avoiding punches/will not refuse to fight anyone put in front of them are: Maidana, Provodnikov, Mathysse, Golovkin, Danny Garcia, Guerrero, Cotto, and Kovalev. Another guy with a great balance of skill, yet not a total defensive guy, is Andre Ward. If any of those guys is on TV, you can bet your *** I'm watching.
The heavyweight division has really suffered from a lack of speed on recent years. With "super" heavyweights taking over, the game has changed to favor bigger, yet slower heavyweights. Marciano, Ali, Tyson, Holyfield, McCall, Lewis, etc. were speedsters compared to the Klitschkos and Valuevs of this past decade.