My 2 cents worth:
I use the British Government SHARP results to buy my helmets.
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Do bear in mind that not all manufacturers / UK agents / distributors send in their helmets for testing (probably for cost reasons). In addition, they should have the latest ECE 22.06 standards.
But then again, some believe standards are fake and helmets should be bought on how they look ....
I prefer modular / Flip Front for our Asian climates. Never a open face as we always end up on the road in a accident. Unless you're Spiderman and can always land facing up, I advise against a open face for obvious reasons.
My personal good value for money and 4 / 5 star SHARP modular helmets are from Caberg (Duke): moderately priced and MT: budget priced.
I'm biased but if making a trip to Singapore, helmets and bike accessories are the cheapest in South East Asia as there's no / very little duty on these goods, only GST at 8%. That's why knowledgeable bikers from Indonesia, Thailand, Philippines and Malaysia shop for their bike accessories in Singapore. Import duty and tax at your destination is another story.
Cheers