ireg403 has been good to me, especially since i got it really cheap. had an issue recently with the mouse not registering that i was holding the click, so considering a gpro wireless
If you're attached to the g403 shape the g703 is a good choice. I switched a few months back and the time to get used to the miniscule differences took maybe a week at most (maybe less if I played the game more). The mouse feels and performs exactly like my old wired g403 but wireless, big fan of it.