I have a question: When you plug the zune into your computer, can you just add your existing MP3's to it, or do you have to buy all your music all over again from the marketplace? Because the way I get my music is I download music vids off of Youtube in a FLV file, and extract the audio from it into an MP3, cuz I'm cheap

I want a zune, but if I'm going to have to waste $100 or more on music I already have, I'll stick with something like my dad has, when I can just plunk in my MicroSD and play music from there. But a Zune has a bigger screen and is more efficient and all. Can you use your existing, home-made music?
Oh, and is the new design of the 80GB and 2, 4 and 8 gig zunes really that much better than the old 30GB? I want a 30 gig but if it's a lot crappier than the new then I might consider an 80gb, even though I'd never need all that space.