Another thing about helmets.
Don't skint yourself buying a helmet. Yes, you need a good one - but you also need to be sure you can afford to buy a new one if you drop it. I spend about £80 a go on lids, and if they get dropped or knocked or old, they get replaced. If I had a £300 Arai... I wouldn't replace it so readily.
I'd rather have a brand new £80 helmet than a worse-for-wear, not quite sure if it's damaged Arai.