Out of the given choices I voted for Gasquet's FH. Shame that richie21 didn't extend it to top-40, because then my vote would undoubtably go to Feli Lopez's topspin BH. When I look at that shot, I still don't get it, how the guy can be among the top-players (yes, being top-40 is being among top-players!) with such a technically terrible shot. And I don't mean bashing him here, because I like his overall game (he's, in fact, one of my fav players), but this one shot drives me a bit nuts, when I see it
Speaking about top-30, I find Davydenko's volleys pretty ugly, and Robredo's and Simon's overall game without any specific shot.