Quieter alternative to the WD 150 raptor

I am collecting parts for a new build. I will be using the Antec P180 case, and soft mounting the HD in the lower level. I am considering the WD 150 Raptor. Has anyone mounted one in the lower level of the Antec P180. If so, how noticeable are the seeks? Is there another HD in the 150 GB range that is close to the Raptor in terms of performance, but noticeably quieter?

Here is a short report on the WD Hard drives; I think yours should be in there somewhere? Regardless it's a very quiet, very high-performance, and very expensive (I wish I had one =/) drive.

The Western Digital Raptor is an expensive disk, but in terms of performance, it is the best Serial ATA disk on the market.

The Samsung SpinPoint (T) have been praised as a silent, cheap disk, with good performance.

http://techreport.com/reviews/2006q3/samsu...-t/index.x?pg=1