My Pfaff Quilt Expression 4.2 has all the items on your wishlist.
The IDT is invaluable for accurate piecing.
Took me a long time to figure out how to FMQ with it, but now that I have a sew steady table lined with a supreme slider, and found the right needles and preferred thread, I’m able to decent FMQ and simple ruler work.
The throat space is never enough (!), but much better than most domestic machines, and since a long arm is not in my future, it’s perfectly adequate. The largest quilt I’ve quilted was probably close to 80 inches square, and we managed.
I don’t know if Pfaff still makes this model, but I would definitely recommend visiting a Pfaff dealer and see what the current version of this machine is. No idea what the price might be, but mine was around $1500 in 2015.