Whitewater kayaking helmet. Which one should I choose?

https://www.backcountry.com/nrs-chaos-helmet

 This is the one I'm looking at, I'm just not sure about what kind of helmet to buy and I don't want to spend a whole lot on a helmet if I find out I need or want something different. I saw some cheaper pro tec helmets that look a lot like the bike helmet I have been using to start learning how to paddle but I'm afraid it will be made with inferior materials that won't keep me safe. Any ideas for a beginner? I haven't been kayaking class four whitewater yet just three and below so I'm not doing anything too crazy yet but they are georgia rivers which even at low flow have been very challenging for me.