I'm using a Kinzu v2 Pro Silver. Just plain simple mouse with 3 buttons, no extra side buttons whatsoever, nice optical sensor (max 3200dpi). Coupled together with a Qck cloth pad also from Steelseries. I mostly go with 800dpi/1000Hz while playing CS:GO, feels pretty good and catchy.
I've been looking for a new mouse so, probably I'll keep an eye on this topic for a while I guess