ProductGPT
Try the custom AI to help you find products that Reddit loves.
I have the note 4. Yes, you need the original innovator edition. That's the only option (well, unless you are not afraid to try and mod the current version to fit the note 4 phone. Search this forum and you'll find out how.). It's $199 to $249.
It's the one that has the white plastic on the top head strap as shown here:
https://www.amazon.com/dp/B018UHFZXQ/ref=cm_sw_r_other_awd_CngcxbZQ4W53Y
You can't have a case on it. You can plug your phone in while using it, though.
As far as the different headset models, there's 3 of them.
As you can see, you need the 1st version of the Innovator Edition. Ouch on the price though. You'll want to find used. There should be enough people ditching them after upgrading to a new phone.
I bought a refurbished version on amazon but it looks like it's not available anymore.
http://www.amazon.com/Samsung-Gear-VR-Certified-Refurbished/dp/B018UHFZXQ
Lucky to have gotten it for $150 but if you do find one I'd recommend getting it. Just get your own sd card
It isn't, need this one: http://www.amazon.com/Samsung-Gear-VR-Certified-Refurbished/dp/B018UHFZXQ