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Flacc is supported but roughly 4 times the size of a MP3 file, not a huge issue but an issue none the less (is it worth the space)


That's FLAC (Free Lossless Audio Compression). I'm (slowly) re-ripping my CD collection, and I'm doing it to FLAC. Before I put the music on the empeg, however, I'm transcoding the tracks to MP3, using LAME's "--preset standard" switch.

This means that I'm OK with file size on the empeg, but I can always transcode the tracks again later.

On the other hand, it does mean that I need a lot of disk space at home (I have a Linux fileserver with plenty of disks, so this isn't a problem for me; it might be a problem for you).

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Vob and Obb (I know nothing about them)


And that's "Ogg Vorbis". It's another format that supposedly gives the same quality as MP3, but at lower bitrates. It's not widely supported (but is getting better). v3a8 on the empeg does support it, so you might want to go this route.

Like MP3, it's lossy, which means that if you change your mind later, you're not going to be able to transcode your files without losing some quality, so you'll have to rip your CDs again.

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MP3Pro


This one's MP3, souped up. It (allegedly) uses about half the space of MP3, for the equivalent quality (putting it on a par with WMA9).

The empeg doesn't support it (and is unlikely to in future), so it's probably a non-starter for you.
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-- roger