I tried Brown and Red switches. I have to say, my favourite is the Duckies by far, with Red switches.
Of all the keyboards though (I'm a freak with them), the AUD 60 apple keyboard wins (has to be replaced once a year). It's just super quiet, and my typing tests show I can easily get more words per minutes on it.
I don't want to be a mood killer, these are just my findings. Apple's are great. Even on PC.