I figure Id find the Chosen on eBay if the extra $ was worth it. Right now its about $20-30 cheaper to get the new repackage version on Amazon, BUT no 40th disc. I doubt that disc is worth the diff but id still like to hear an opinion from someone who's seen it.
The main featurette on the disc, the roundtable is definitely worth it. Haven't watched it in some years, but it was pretty insightful, and Joss is always hilarious. That runs about 30-40 minutes. The other featurettes are good, 5-10 minutes in length. If you're a Buffy addict, you probably will wanna go for the disc.