Get at least a SA 2010 as most organizations no longer allow a SA 2005 to be used
Don't get a non Snell helmet as most organisations require Snell rating
One of the differences between a lower cost helmet and expensive ones is the weight. More$$ = less weight. If they both have the same Snell rating they should offer the same protection
I just bought this one
Pyrotect Full Face Pro Airflow SA2010 Helmet Closeout White
What is nice about the Pyrotect helmet is the cheek and head pads are easily removed and interchanged for fir. Pyrotect will send you a different size of pads, charging you for them, but refunding the full amount (less shipping) when you return the ones you don't want
The helmets come in 2 shell sizes, XS-M and L- XXL with the only difference being the thickness of the pads
BTW, that helmet looks exactly like the Pyrotect one
As others have said, find a place that sells helmets and try them on for fit