I will always prefer a Western Digital AAKS drive over a Seagate. I don't know about the 7200.11 ones, but all four of the 7200.10 Seagates I have/had were ALL noisy. They weren't bad, but all of them "click click click." All of them benched a bit lower than the WD AAKS one I have right now.
I also do not believe the Raptor is worth the money.
I've been hearing good things about them and I was curious how they stack up against one of seagates 250gb drive.