MIDI files unless you're the composer and the site is about your music. The only thing worse than waiting for 200K worth of gifs of your dog to download, is being treated to the music of John Tesch throughout the process. If your page is about the things that matter to you, it will matter to others. If not, not. Point them to the sites they've never heard of.
Passion beats demographics.
Don't be afraid to revel in subjects that interest you, however obscure. Someone else will want what you have. If you don't believe me, slip on over to the Spam Haiku Archive or alt.cult-movies. If your page looks like every other page, make sure it reads like no other. Acknowledge your influences with a link and a nod.