I would pass from the G502 ! . Although its a good mouse but its on the heavier side, i`ll only recommend it if you have bigger hands. I used the same mouse for 1 yr , moved onto the the G403 and was amazed to see the results.
I would recommend checking out G403 or Razer Death adder elite. G403 is a bit expensive then the G502 (8k vs 6k )