I'm kind of curious why, honestly. I use a Model M keyboard, which is so bad for me because I can definitely feel the pain in my wrists/shoulders, when typing, but I wouldn't give up that feedback for the world. I do want a really, really nice ergo keyboard I saw a while back, but I can't remember the name, and at $200 it was a bit spendy.
Regardless, yeah, get one of those "indestructible" keyboards. They're like rubber, and the keys are super, super quiet.
Like this. As far as the mouse, I don't know. I have a Logitech MX500, and the clicking of the buttons is relatively quiet. I don't know of an absolutely silent solution, though.