depends on your setting..

Better get back DA..the ergo of DA is the best
i used both all those mouse before
and i hate imper the most
due to its plastic sides, the right side blocking my ring finger which is quite annoying

Xai/DA if under tight budget
Sensei if it suits within ur budget

Externally
One is pure black and the other have blue lighting
Internally=Same

I havent touched black edition before
but i think BE is all rubberised including the sides
while normal DA is top rubber side plastic
Do correct me if i were wrong

I think its full plastic for that one

My Razer DeathAdder no sign of peeling after 1.5years of usage

Its good...shape and sensor is good
Only bad part for me is the lift off distance

Try SteelSeries Sensei(RM399) or Xai (RM249)
Both have realy good sensor quality
But the bad part is the outlook can be easily corrupted if not taken care properly

tracking speed as high as possible for FPS gaming
DPI high enough for your sensitivity
Most important
>>>>>>>>COMFORT<<<<<<<<<<<

send it for warranty

Personally its too high for me
Imperator and mamba's lift distance enough for me
which is 1mm
but i dont like mamba's weight

thats why
why use mamba if its wired...kinda pointless to spend for rm399 for that right?
plus battery life isnt that great
Duno about the 4G, im talking about the mamba 1st gen

Nope you cant
Only sensei allows you to do that