Keyboard - some dedicated company like Das Keyboard, WASD, Vortex or even CM Storm, but don't give crazy money for just light effects!
Mouse - Razer will be my choice. Razer Deathadder is great. Also Zowie are good aswell! Headphones - Modmic + some decent headphones. I got ATH-M50x myself and they are great. They aren't that cheap, but are great. Go for Sony, Audio-Technica, Sennheiser, AKG, Philips, but not "gaming pro 1337 headphones wtf insane sound" shit.
Or you can go with keyboard + mouse Razer (if you want to look awesome) and headphones. But never buy gaming headset.