mostly about learning to play the piano
The Samson Carbon 49 looks like the way ahead. Semi weighted, works with the iPad.
I to have been playing around with the old ivories. This looks good. I have a Line 6 mobile 49 but it has no docking space. What teaching apps are you using?
I've had a quick look for apps, but can't find anything that jumps out at me. Couple of years ago, when I was trying to do this with a PC, I gave up on the Piano Lesson software I had - it began to feel very clumsy and clunky. I think if I just get something that's going to work with the midi keyboard, that should be enough. And use proper paper music. I'll let you know how it goes.