Keyboards:
I've heard that the K70 had some issues with defective LEDs on a few of its production runs but this has been rectified as far as I know, and you can RMA if not.
Personally I opted for a K95 with the extended macro keys (18 attached to left side) and MX Browns. It has a nice, textured anodized aluminum backplane with an ABS underbody as well as a braided USB cord. The only problem I have with it is the power draw: it uses two USB male connectors instead of one. I don't really use any of the advanced lighting programming (animated, etc.) but I was able to easily change the color of each individual key and I make use of the mode switches at the top of the keyboard for swapping custom lighting setups. The volume bar is a scroll-able metal cylinder and it feels great. The best part is that you don't have to rely on software-only lighting. You can program separate in-hardware lighting configurations in the event you use GNU/Linux or another OS (though I believe there are some open source third-party drivers).
That being said, I've heard that Das Keyboard is neck and neck with the K95. It definitely has a more professional profile and doesn't feel as "video gamey" as the K95, not that the K95 is particularly video gamey to begin with.
KBC Poker 3
amazon.com/Mechanical-Keyboard-Keycaps-Cherry-Mx-Clear/dp/B00W02J7Y6
Das Keyboard 4
amazon.com/dp/B00JI2APZQ
CODE 104-Key
amazon.com/104-Key-Illuminated-Mechanical-Keyboard-Backlighting/dp/B00LV5P2N8/ref=sr_1_1?s=pc&ie=UTF8&qid=1468976786&sr=1-1&keywords=mechanical keyboard code
I didn't list the Ducky Shine 5 because most people don't want something that looks like someone decided to rice a generic, comes-with-the-computer keyboard and put mechanical switches in it. It does perform about as well as any other keyboard in it's price bracket though.
Whatever you do, don't buy any of Razer's bullshit. I made the mistake of getting a 2013 Black Widow ~2-3 years ago and it started double typing after about 2 years. The switches were plate-mounted and thus I could not remove them for cleaning. Alcohol/canned air wouldn't work either. The plastic was this matte-black ABS that eventually started to fade and had a habit of smudging quite easily. The audio passthrough was poorly isolated so you got interference and hissing even with no active signals on the line. The paint on my W key had more or less completely rubbed off from gaming because the paint they used was shit that wore way easily and had a poor binding to the plastic keys. I should have been wiser considering I already knew Razer headphones and some of their mice were notorious for problems and poor build quality. I do own a Death adder but its design is so simple that even they couldn't really fuck it up.
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Headphones:
No gamer headphones. Also, stay away from Beats and Bose, this is brand-name trash. I have some Beats that I got as a gift. My specific model is discontinued and was ~300 dollars – the sound quality is completely beaten out by my shitty, second-hand Grados (SR80i) I bought for 70 dollars. Though I will admit that they have a surprisingly nice full metal construction.
Do not get combo mic-in-headphone systems and especially stay away from snake oil like the Razer Tiamat. Without going into too much detail, the 7.1 surround sound is a gimmick considering the drivers are of poor quality and their proximity to your ears makes the "surround sound" aspect virtually pointless. Your ears are essentially tubes of meat that operate in stereo. Open air surround sound systems work because of the interplay between your room, the acoustic properties of your head, and the slight timing differences the result from the distance traveled between each individual speaker and your head which. Your brain exploits these principles to extrapolate the illusion of positional audio. Most games already mimic this effect for stereo headphones using audio interpolation algorithms and most music is only 2 channels anyway, not that it would make a difference for the aforementioned reasons.
Some good brands are Seinheiser, Audio Technica, Shure, and Grado (good for metal and they have some decent stuff). Sony actually has some good headphones for their specific price range if you are looking for something south of 100 dollars.
A good all around recommendation (HD 598 Seinheiser):
amazon.com/Sennheiser-HD-598-Over-Ear-Headphones/dp/B0126HISOO/ref=sr_1_1?s=electronics&ie=UTF8&qid=1468978459&sr=1-1&keywords=hd598
and I'm personally eyeballing these to try out:
amazon.com/V-MODA-Crossfade-Over-Ear-Noise-Isolating-Headphone/dp/B00A39PPDK