Accessibility features in 9 Pro vs. 9 Pro Extended?

We were recently upgraded from Acrobat 8 to 9 Pro, but I was told last year that to really get under the hood when making docs accessible, we would need 9 Pro Extended. We'd like to be able to justify the additional upgrade, but the comparison table on the Acro home page (where the bean counters look) only shows a handful of features added in 9 Pro Extended that we don't need (audio/video related, mostly).

We process Word docs, PPTs, XLSs, existing PDFs, and even scanned PDFs (!) from various agencies. We do what we can to clean up and structure the original docs when possible, but we often end up messing around in the Tags & Content panels, which are way easier to work with in 9 Pro than they were in 8. We also produce fairly complex fillable, "accessible" forms, also much smoother in 9 Pro.

At this point, our mandate is simply to provide a clean accessibility report from Acrobat with each PDF. I know that doesn't necessarily mean they're truly accessible or 508-compliant, and someday the powers-that-be may figure that out, but for now, that's all they want. We've been asking for a real screen reader like JAWS for over a year; it may be forthcoming in the not-too-distant future, but in the meantime we limp by with ROL.

In general, 9 Pro is making most of our work considerably less painful. We're grateful to have it!

But if 9 Pro Extended would make our lives even easier, we'd love it! Can anybody tell me if there are features that we need in 9 Pro Extended that we don't have in 9 Pro, like better ways of working with tags or less cryptic acessibility errors?

Thanks!
Caroline