The Fender Discussion page has recently changed its name to the FenderForum. Forum seems to cover all of the basses as SUNN has had guitars, PA Gear, lighting, etc. Might you consider SunnForum.com?
Bass-ically Yours,
Sunnboy
This discussion list page sure, but the whole site? I had to give a presentation to a group of people regarding how to register domain names so I grabbed http://www.sunnamplifiers.com as an example. Whether or not I plan to use that as the official title for this page is something i'll decide later.