Well, depending on the visitors screen resolution, your website will preview differently. On my screen, (resolution is 1024x768) your website has about 2 inches on the screen on each side of black background.. I know for my screen resolution Lisa's site fills up my entire monitor, and her site width is 1000 pixels.. My site is 850px so people with really low screen resolution can fit it on their screen.
But its a personal opinion.
Hope that helps somewhat.. (what an over use of the word screen up there..

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