I currently have a Logitech mouse, keyboard, webcam and headset.
While my girlfriend has a top-of-the-line Corsair keyboard (and loves it), I'm using one of Logitech's cheapest. It cost me $14 (with a mouse) and I love it. I liked it so much, I bought a spare one in case they discontinued the model by the time this one wears out. I build a new system every 3-4 years and this is my third computer using this same keyboard. I'm not using the cheap corded mouse that was packaged with the keyboard. I'm using a cordless laser mouse (M705).
I can say one good thing about Razer. I have a corded Razer headset that worked great for many years (and still does) and it was fine when I lived in a studio apartment so small that the cord allowed me to walk from the computer to the kitchen. When I got a bigger place, I got a wireless headset (Logitech G930). I've had it just over 7 years and had to replace the ear pads, which are easy enough to find online and replace.