I wish I could say I couldn't play without any specific part of my gear, but everything I have isn't top quality, but it gets the job done. If I had to choose though, I'd have to say my mouse, though I don't know the exact brand, it is wireless, that is a lot better than not because a cord is just far too restricting.
I have a cheap wireless logitech mouse that has lasted me four years now, and I only have to change the two batteries once a year they drain so slowly with it. It's FANTASTIC.
Couldn't live without my Razer DeathAdder and Sidewinder x4 keyboard
I finally caved and got a Logitech K360 and m215, which are both just your regular wireless keyboard and mouse. Wireless has been the key for me. I can play from several feet away if I want, or chat with friends with my keyboard with out having to be right there in front of the thing or using vent. I would love to upgrade to gamers keyboard mouse and headphones so I can play better. Being a mom limits the fundage for me:)
My fave gaming peripheral at the mo' is a Sennheiser PC350 soft pad over the ear headset with boom mic - comfy as, for hrs of play - as usual when u love something to death the only problem is to decide what to buy next, maybe HyperX?
I don't think I could ever use another keyboard. I am in love with my TT esports Poseidon Z, and imo think that it's better than the Blackwidow by Razer.
I adore my Razer Naga Epic mouse! I'm definitely hindered when I can't play with it.
Could not go without my G500 mouse ^-^
The razer naga mouse is incredible, couldn't live without it!
My big screen TV. Its great to hook up my computer to it and see WoW and other games in big screen glory.
My Razer Diamondback mouse, its been with with me since my first MC raid, survived when my PC was stolen, and its ready to go again for WoD.And yes its looking a bit worse for wear after 9 years of gaming, but its sturdy and been with me through the highs and lows, and many a boss kill.
I couldn't live with out my Razer Carcharias Headphones, large soft ear pads that don't crush my head.
The macro capabilities on my razer blackwidow ultimate maximise my raiding capability and the keyboard feel overall just effects the way I play, even in PvP it causes me to achieve more.
II really enjoy my Steel Series mousepad, sadly I dont have the income to afford anything other than the basics for peripherals.
I couldn't live without my Razer Naga Epic, I love this mouse, it's great for gaming, or going wireless to the couch to chill out and watch movies :) :)
My Razer Naga MMO gamming mouse.
Since I got my World of Warcraft Legendary Gaming Mouse I can't play without it!
Alienware Keyboard ;o)
Razer DeathAdder and game pad
My most important gaming peripheral award goes to contour rollermouse. Having a secondary mouse below keyboard, operated by thumb makes it possible to easily play with just left hand. Can't get more convenient than that!