I'd rule out the hybrid option, if you can. Induction is far better; you will be annoyed at having two hobs you like and use, and two hobs that are slower and mostly unused. In the years ahead, you'll be happier with induction vs. an electric range option, if you can afford it.

Downdraft may be a problem with some slide-in induction ranges, like the E'lux (which pushes the downdraft vent so far to the rear that it may be ineffective). Perhaps GE's induction range is a better option for you; I'm not sure.

I agree with chac mool. My new induction cooktop is one of my favorite things in the kitchen. If there's any way to do it, get all induction.

Do the induction, but skip the downdraft. It will be useless. Do a proper overhead vent.