Like Gina, I've had a DaVida 3/4 lid the past ~5 years. It's quiet (windnoise), the leather lining fit is excellent, the size is less than "Marvin the Martian" proportions, so I like that also. I don't know firsthand about the other brands you mention, I know they are reputable.
http://www.british-classics.com/ I was hesitant about mail ordering a helmet, but when the first one didn't fit, they exchanged for a size larger, no questions. I'd order from them again
Good luck
jh
