I have my website thru Yahoo! and use Sitebuilder.
I do all my editing on a Mac.
(It's like being blind in your left eye & deaf in your right ear at this house!)

I'd love to be able to upload my QT movies to my site, but Sitebuilder can't support a Mac.

Which bums me out.

What's the best way to upload video to my site? I'm not against using Vimeo or YouTube, but I would like to have all my videos on my site.

Any suggestions for a solution?

Embed your videos from a 3rd party service (like Vimeo) using the "embed" button onto your site.

Vimeo also has a nice widget that generates code for you site, and allows you to have a page on your site display an entire category of videos, automatically. Thereafter, any videos put into that category on Vimeo will automatically be embedded on that page of your site.