Welcome to the forum mate.
I've been using this RXT helmet for 5 years now. Through that time I have been flung 2 metres into rock ground, endoed so hard that I did a full flip in the air and landed flat on the ground and dozens upon dozens of other stacks that I can't even remember. Oh yeah I highsided at around 60 kp/h. I've earned 7 concussions while using this helmet. I absolutely SWEAR by this helmet it is the real deal and saved my life atleast once. I can definitely vouch for RXT but I'm not even sure if they're still in business. It was a mid price helmet and its only starting to loose its charm now. Bell helmets are good too, been around for a while. Shoei are expensive, but from what I've read, they're worth it.
My word? Buy something that fits you well and is suitable to both your budget and skill level. And from my experience, when you're starting to get better at riding is the most dangerous time because you're trying new stuff and being faster at it. If you buy something expensive now you wont need to buy another later, unless you're growing still or get in a serious accident.
Good luck mate, hope you find a good one.