Buying a new helmet is not such simple thing... during the 20 years i have ridden a bike i have owned Nollan, Bieffe, Shoei, Suomy, Scorpion, and Arai helmets.
Currently i use an Arai Chaser V helmet that i got for a good price on ebay. Definetely the best helmet i have ever used, the quallity and comfort are excellet and although the price is a bit high on Arai's you get an excellently designed and manufactured helmet. Suomy helmets are good too, but are no match to Arai in quallity.
Shoei manufectures quallity products too, but the one Shoei ride i have owned was absolutely horrible to use since it does not fit my head shape, but this became apparent only after about 20-30 minutes warring it.
So my advice is to try all helmets that interest you and buy the one that feels the best. But if Arai's suit your head shape, i definitely recomend it as a good long term investment on comfort and safety.