I used to wear Shoei and liked them, they fit my noggin, I liked the way the visor changed, and I didn’t think they were too loud. But I replaced my last one with an Aria Corsair V and I was amazed at the aerodynamic difference. The Arai really seems to cut through the air better. It especially doesn’t seem to catch as much air when I turn my head. And it flows a ridiculous amount of air. That said it is the loudest helmet I have ever ridden in, not a big problem on the track but it's not as street friendly as the Shoei.
One helmet I might consider is the carbon fiber KBC. Cobie was riding one last year and really seemed to like it. When he showed me his I was impressed by how light weight it was. And I believe it sells for less than $400.