Oh man dude they're the best! A close friend of mine sent me a Steel Series 5Hv3 headset a while back. I absolutely loved it. One of the most comfortable and best headphones I've ever had.
And as a big CSGO fan, my teammates finally got me to buy a legit mouse where DPI can finally be adjusted (before that I was simply using an old off the shelf mouse). I finally went with the Rival 300 and oh man... it's so good. Also I was told a proper mousepad was needed as it "changes everything light and day". So I finally went for the XXL while it was on sale!
During black friday, I also bought another mouse (another rival) and the Steel Series Siberia v3 bundle that was also on sale.
I probably should have directed you to their site during Cyber Monday/Black Friday. Their sales were so good. Totally worth it for the price they sell it for and the quality that you get.
Honestly to say, I love Steel Series. Some good friends who are using other brands such as Razer are having issues with sticky keys and just breaking easily. However, I wouldn't mind getting a sennheiser headphones (I hear they're the best in the audio industry), and I heard Zowie has some pretty good peripheral devices but I've never tried it.
I don't have a mechanical keyboard, but I wouldn't mind getting to know more about it (can anyone talk about how big of a difference it makes? Because I don't see any major difference between the keyboard I have right now, which is a Dell L100 vs a mechanical keyboard).
I love my setup right now.