Sure, I'd like to see the additional documentaries, if they're any good, but no way can I afford to double-dip.
Bonus features are becoming pointless as a buying incentive nowadays since they inevitably end up posted on youtube.
Aside from new commentary tracks, that is. I don't know if they have any new ones though, just the bonus disc. I pretty much guarantee* the entire bonus disc will get uploaded to youtube.
*not a guarantee