They all sound like they'd add value, but the only one I'd really like is the PDF. In fact, these days I'm more likely to buy the PDF than the physical product for almost everything.
But it does need to be a PDF, and not some other ebook format (even one that's 'better'). Because the main use I'd make of it would be for a game I run at work, using my work PC. For very good reason, they've blocked pretty much all gaming sites, and of course I can't justify installing dedicated software for a game on my PC. But I can justify a handful of PDFs, and we have a reader already.