Ok....I have seen a lot of retail sites saying the chips were 800MHz FSB, but Intel lists the 3GHz as the ONLY chip with 800MHz.
http://www.intel.com/products/deskto...proc+prod_p4p&
Just make sure you know what you are getting. Sometimes retail makes mistakes.
I have always liked antec cases. I know the SLK series are fairly quiet, and the performance plus series are some of the quietest I have ever used.
Some advice for a quiet computer:
Get adjustable-speed fans. Watch your cpu temp and figure out the lowest setting you can keep them at when the comp is idle while still keeping the proc cool. You can set your case fans to a low speed when you are not gaming or using intensive apps.