The following is coming from a beginner and I don't don't consider myself a musician. I am happy to play the song simply and the same way every time (except for mistakes and/or a few variations) and the people I play for are dancing don't care as long as I keep the beat. So.....

Demonstrations, phrase by phrase - definitely (like vol 3)
Left hand - at least a demo showing both hands
On screen tab - helped sometimes
Tab like vol 3 - definitely. Helps me learn the techniques as well as the tune. I like the tabs for the same reason that people on this form ask for help on lyrics. It tells me exactly what how you played it, helps me learn it and helps me remember it. But eventually I incorporate my mistakes (or simplifications) and it becomes my own version.
B parts to vol 1 - definitely
Theory - interesting, but doesn't help me.
Chords/accompaniaments - sure
Rhythm/accents - yes
2 DVD set - sure, charge a few more bucks - it's worth it
The play along is not so important to me, but my wife plays guitar and keeps me on the rhythm
Songs - easy version of Amede two step

Big Nick - thanks doing this. You have helped me a lot with volumes 1 and 3 already.