So after my second Razer Taipan is slowly dying because of the exact same issue the first one had (side- and middle buttons stopped responding) I'm going away from Razer and am now searching for a new mouse.
I only need 2 buttons on either side (so please nothing Naga like)
Right handed
Clickable middle button
Customizable buttons
If possible a bit larger than normal mouses
Not more than 75€
Not freakishly ugly
Mostly used for WoW and Heroes of the Storm
For reference this is the mouse I used before (before the Taipan I had a Roccat Kone and was really happy with it but after some years the LMB gave up:
http://www.razerzone.com/gaming-mice/razer-taipan