I can wholeheartedly recommend the G402, picked mine up for Rs.1800 off of Snapdeal around 3-4 months back and it's one of the best mice I've used right out of the box.
Putting in more than 2k is anyways a waste of money, even expensive mice are prone to double-click issues so you might as well get something cheap with a 2 year warranty.
It doesn't have the same sensor as the 502 but all those 75000 dpi's and RGB swag is for 12 year olds who think it'll improve their game.