I'm usually not interested in brands, my policy is generally 'whatever works'. But I do have soft spots for some stuff.
Mice= Microsoft, don't know what it is, but whenever I use something else it always breaks after a while. Logitech failed me twice and I've always gone back to Microsoft. My first mouse was a scrolling intellimouse, my Dad's mouse (probably the first one I saw) was a Microsoft mouse, my current mouse is an old optical wheel mouse... yeah, I guess I'm stuck on Microsoft Mice.
Keyboard= I never cared about these till around 2011 I got a Unicomp replica IBM Model M. It's now what I consider to be 'the PC keyboard', everything else is an imitation as far as I care.
Headphones= I got a refurbed Koss 4aa headset. It's a heavy mofo. My neck started to hurt after a year or two of use. But they're my favorite way to listen to audio.
Harddrives= HGST Deskstar, no real reason, I just like the IBM legacy.
Creative= I just like the name "soundblaster" Even though computers don't really need dedicated soundcards anymore I still like my soundblaster.
Controller= I never liked "PC game controllers" I always end up with a USB adapter and either a
-Sega Saturn
-Super Ninendo
-Playstation 2
They work great for emulation purposes.
Camera= I know its silly, but I go for logitech because they own the original quickcam rights