As a PC user and occasional twitch-gamer, I personally stick with plain 104-key USB keyboards from Dell or Microsoft (quiet you), since they're fairly cheap to replace at local thrift stores. If my keyboard happens to die by misadventure, I'd rather not drop another $60+ just so I can use my machine comfortably.
When it comes to notebooks, the answer for me is and has always been ThinkPad, though the MacBook Pro/PowerBook keyboards are pretty solid as well. Sadly, nobody seems to be donating any MacBooks to my cause... :{