This question has been done to death in the past.
Everyone will throw their two cents in as to how their helmet is comfortable, or is the best one known to man. But in reality the best helmet for the job is the one that provides the most comfortable fit with all the extra's that you may need or want (eg NVG mounts, ANR etc.. etc..).
No point buying an alpha 900 is it feels like a bucket of crap sitting on your head vs a gallete that may or may not fit better.
Also remember, you may join a company down the track that requires you to wear the helmets from their s.e. room. So the helmet that you do purchase now starts collecting dust like mine.