I've got a BendPak 2 post and love it. I've not used it for the ZT yet but will this spring. Before getting the lift I would just use the forks with straps to lift the ZT for working on it. I've not needed the lift to work on the tractor yet, but size wise I don't foresee any issues. The B2650 should fit fine. If I had a big boy tractor I don't think it would work.
I went with the Grand Prix series because it was the tallest that would fit for my 10' ceiling and has a top beam instead of a floor plate so nothing to trip over under the vehicle. A little harder to install, but using the forks to lift the top beam made it pretty easy.
For anyone considering installing a lift, double check your floor. I had some spots that were not quite as thick as it was supposed to be poured and ended up having to cut out 2 large squares, dig dipper, and repour. That was the hardest part of the install.
This has been a great thread. I hadn't seen many of the attachments that folks have posted. Always learning, Thanks.