You can consider the Arai RX7X (~$700) or Shoei GT-Air (~$600-700) both from the authorised dealers here in Singapore.
Most important part is getting it to fit CORRECTLY. Measure your head's circumference and get the right size helmet for you. 90% of bikers i know are wearing the wrong sized helmet with the most popular being an M due to "best resale value". I was wearing an M for the longest time until i measured my head to be 55-56cm meant that i was an "S" size and now i feel much better with the helmet.
Secondly, if safety is of utmost importance to you, get a full-face helmet. Not half or 3/4 or modular helmet. Read in a statistic somewhere that 35% of motorcycle accidents result in chin injuries which can only be mitigated by a full-face helmet (or modular but the hinge would be the weakest link).
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