You might want to add the PTB version to your list.
http://www.badgergraphic.com/store/cart.php?m=product_detail&p=2766
The HZX is the Ebony style camera. Just glancing at the TZ I've no idea how that differs. Less rear movements?
The PTB is the Phillips style camera.
My expierence is with the HZX 5x7 style and the FCL-810 which I guess the PTB is a smaller version of. They're different. Best you can do is search for the threads on Ebony and Phillips. Different strengths. Different weakness. The Ebony types are heavier with longer bellows. The Phillips types are lighter but go much wider.