From experience, I'd say due to the branding and competitive nature of games nowadays, it's easy to get suckered by gaming peripherals. Between a friend and I, we've bought about 5 Razer peripherals (headsets to input devices), and ALL of them have died or failed within 2 years. Not only that, but their drivers are dysfunctional. That's a really shit success rate. My MX 518 Logitech mouse I use at the office and got for under $30 has been bashed on for over 8 years and is going strong, super precise optics, never an issue. Kinda says something.
I use a mechanical keyboard at work now, because they simply cannot be compared in typing comfort if your work entails much. At home, I use a very cheap "gaming" keyboard. My criteria is: it has anti-ghosting or whatever so you can press multiple keys at once without the computer wigging out and beeping, backlight, and functional volume/media controls. Simple drivers that work is a plus. This keyboard cost me less than $40.
For my gaming mouse, I use a Steelseries. Gets the job done, clicks nicely. Pretty lights on it, and nice grip to hang on to. So when you say "gaming" peripherals, unfortunately this covers a very wide spectrum. Gaming keyboards go from $30 up into the hundreds, I think if you like to type a lot then go mechanical for sure, but unless you *really* need all the light shifting and macro programming, just avoid the higher end stuff. They're not going to make you better or anything.