I've owned, used, abused, crashed, rashed and retired many many helmets over the years.
They all had their pros and cons, but ultimately I buy helmets for protection and I am always looking for deals as I know as some point it has to be replaced whether from age and use or because I crash tested it.
The ones that I have stuck with are are the Scorpion, Suomy and SHOEI brands.
All my SHOEI's have been noisy, but I like the way they fit. I tend to buy the cheaper ones so they are always heavy compared to the more expensive lighter versions. I just deal with it.
The Scorpion products really impress me. Probably the best value for the dollar in my opinion. Good build quality, nice paint, fit & finish is always nice and they are both fairly light & quiet with good sealing shields and a soft, form fitting interior.
The Suomy not so cheap, but it's like wrapping your head in a silk scarf. I love putting my Suomy on. The feeling is as close to having sex as you can get with your leathers on I can also attest that they crash pretty well. I suffered a concussion last time I crashed in a Suomy, but the helmet looked like it had been through Afghanistan twice so I felt pretty lucky to escape with just a headache and some lingering dizzyness.
The Vemar was the best anti-fogging helmet I have ever used in rainy conditions. Outside of that respect I think it was a pile of shit with plastic vents busting off with the slightest nudge and decals you could feel under the clearcoat etc.
ARAI's are super nice helmets for people with A. super nice bank accounts and B. a particular head shape. I have neither of those...
Fulmer & HJC had always served me well over the years, but they were always more of a backup helmet for me rather than a mainstay of my gear still I cannot really say anything bad about them.
My wife is a huge AGV and SHARK advocate she has used both extensively for years. The AGV is the better helmet, but the value of the Shark helmets is not to be taken lightly either especially if you don't mind buying closeouts or care what color scheme etc to get the really good deals.
I've not tried any of the new Bell helmets, but I have heard good things about them and would love to get my hands on one for testing. I have a hunch they have really upped their game and deserve the marketing hype that has been put on them lately.