I got a Copperhead, because I got it for 2000Rs.
Funny thing is, after buying it I mostly play TF2 which isn't exactly a precision shooter.
I'm not a believer of the fact that mouse and KB can improve someone's gaming abilities. I wouldn't have paid 4000Rs for a new Copperhead. 2000Rs was a killer deal and well, the only mouse IMO sexier than a Copperhead is the lachesis. All other come secondary but then again, that can vary from a person to person. I hardly use it at its max DPI but the refresh rate is fantastic. Never a lag of any kind what so over. Switching configs on the fly is quite easy.
So for your first question, the Copperhead is a fantastic mouse. For your second, it'll depend on a lot of factors. Like if its price is a concern, the looks you prefer, and if you really need the higher DPI.