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I think my keyboard has green switches, but I really like any of them that have that tactile feel and the click sound. Blue's are the ones that immediately come to mind. Anything that replicates the IBM Model M is a sure win for me.

Looking at the web page where I bought this, it says that red switches are "somewhat quiet", good for a shared environment, and brown switches (the other they offer) are loud and very clicky. That's funny, cause this one seems pretty loud and clicky to me. I wonder how much more the browns must be!

I wonder too! I might have a keyboard with brown switches laying off to the side in my office. Nope, it's blue switches, I was wrong :)