Western Digital Caviar 750GB (WD7500AAKS). Quiet, cool, fast. Has similar read and write times as the Raptor, but has an average seek time compared to other drives. Whether or not the seek time is important to you, I don't know.
Some reviews:
http://www.hothardware.com/Articles/Western%5FDigital%5FWD7500AAKS%5F7
http://www.anandtech.com/storage/showdoc.aspx?i=3061
http://techreport.com/articles.x/12673/1
I was going to go with a Raptor for my next drive, but looking at this drive changed my mind. Similar performance, cool, quiet, and 750GB for less than the price of a Raptor.
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