There are guys who are really good drawing charges: Bogut, Ginobili, Bell, Jarron Collins, Nash, Harris when he cared about defence... I don't think these guys are floppers at all. If you are in good position to draw the offensive foul, it's difficult to keep balance and not fall; plus, it makes easier for the referees to see the charge.
Varejao is a bit of a flopper, as in he exaggerates contact frequently, but he also plays good defence and draws legit charges by sacrificing his body a lot (in the D. Fisher/R. Horry way). To me the biggest flopper in the NBA these days is Chris Paul. I'm surprised he isn't on the list. I'd also nominate Reggie Evans.
Bill Laimbeer ´was probably the greatest flopper of all times. Divac was very histrionic, almost artistic, but he wouldn't flop as much as Laimbeer. Rodman was another notable flopper from the 80s, only second to Laimbeer, IMO. Karl Malone also had a good flop among his formidable collection of cheap tricks.
Watching old games, the flopper who has impressed me more was a Celtics player, Frank Ramsey (in all fairness, I never cared to find film from games without the Celtics playing, maybe there were more impressive guys). I always found the famous anti-flopping instructional video from Red Auerbach quite cynical when he was on the bench seeing Ramsey falling left and right pretty much every time he was touched by an opponent.
