I say (and I hate to say this... seriously I do), but my thought is to buy the version with the most content and then just download anything you are missing from the bulk of the releases. I'm a completist when it comes to STP discs, but the variation between exclusives has been marketed so poorly that I'm not doing the multi-buy with the new album.
The main STP site should clarify all of this. The end. I say go with the Target version as it has an extra disc, and then find the other tracks online. Most of us already have the Chicago concert by now, as well as the Unreleased Outtakes. Hell, I'd bet the disc and inserts I made for my set are cooler than whatever you'd buy at the store, anyway.