Mac Fonts on Windows, need suggestions

Hi,

Recently I downloaded a few Macintosh fonts that were available on Apple's web-site and I would like to use it on my Windows OS, sadly I don't have a Mac

But I am unable to find the right combination. That is, if a Mac user asks me to try out the default Windows Font on Mac, I would say it's Tahoma but can you tell me which font is the default on OS X. And I tried "MACGrande" instead of Tahoma on Win XP, but doesn't look great

Can anyone suggest me the fonts to try out.

And I guess Windows Vista has a new default font called "Segoe UI", which replaced Tahoma.