I've been commuting 12 miles round trip almost daily for the last 3 months. My wrists and hands do get fatigued often no doubt from the straight fork. I'm considering upgrading the fork on my Seek. I've read that a carbon fork could help reduce some road buzz. I've heard good things about the Nashbar Carbon Cyclo-Cross Fork which has the disk mounts I'd need.

A few things I need advice on.
Are carbons benefits fact or fiction? If so is it worth it?
Will I also have have to change out the handlebars, stem, etc. to accommodate this fork?
How hard is this and what price should I expect to pay?
Anything else I should be aware of?