I don't think Laxman is the best slipper in the Indian team. In fact he drops quite a few there. I think Sehwag is a quality slipper although he has stopped fielding there after he injured his finger or something. He did drop a few but he was more-or-less consistent.
Dravid is an amazing fielder at slip for spin, but he was an even more amazing forward-short-leg/silly point fielder. I do not remember which tour it was but he took some amazing catches off the spinners, just centimeters off the ground sometimes. As for Zaheer, I think Irfan can probably match him at Fine Leg and Third Man.