Like others have said; helmet matters. If both have the same safety rating, an inexpensive full-face helmet and a high end one will be about the same in terms of protection. But the high end one will be a world of difference in comfort. What you're actually paying for with a $600 helmet, is thousands of hours of wind tunnel time and engineer time to develop a helmet that flows through the wind and doesn't make noise. The materials used are the same; it's the R&D they're trying to recoup.
A good windshield (and lowers, too) make the biggest difference. Together, they cut down on the wind in the first place. No wind, no wind noise!
Even with a full fairing, quiet exhaust, etc., I still tend to use earplugs on long trips. If your ears are ringing after a ride, you've damaged them, period. That damage accumulates over time until you're the guy with the squealing hearing aids yelling at the waitress that you don't understand what "alfredo salad" is and she's trying to say the special is "potato salad". I SHOULD wear them all the time on the bike, but at least I do wear them on long rides.