I've used a variety of high-end helmets in my riding, once I re-entered the riding scene (I was about 40 years old, then, I guess, after about 20 years off bikes).
Started with a Schuberth C3 (may be wrong on the model), it was a flip-up. Very pricey, and for a long time stopped being imported into the US, but I hear they are available again. It had a seat-belt type chin strap, rather than the more customary D-ring arrangement, and I grew to hate it. Also, I saw a Schuberth that had been recovered from a crash where the rider survived but in which the chin piece had been broken off at the hinges. Ugh. So, time for a switch.
Went through a variety of Arai helmets, including the high-end Corsair. Very, very happy with all of them, very comfortable, relatively light, great ventilation, loved the way the visor could be easily snapped on/off (clear versus tinted visor). Very pricey. Couldn't wear their dual-sport helmet because it was the wrong head shape for me. The Arai's were great, but then I saw Long Way Round and of course I had to get a "real" dual sport helmet.
Got a Shoei Hornet DS, which I still use to this day. Pretty pricey, think I paid $500 or so of it. Weakness as a true DS helmet is that the beak on top isn't really long enough to serve the intended purpose, but otherwise the helmet is perfectly comfortable (for my head). On the more serious down side, the Hornet DS fogs like crazy in cold weather. Just a couple of weeks ago I managed to get a pin lock visor and insert for it (had to order the insert from the UK, by the way, you shouldn't trust the Amazon vendors claiming to sell the Hornet DS insert in the US, they'll send you the wrong insert). With the correct DS insert in place, it's a changed helmet--fogs all around the insert, but the center area of the visor covered by the insert is perfectly clear. Amazing, really.
(I should mention my bike is an R1200GS Adventure, which has a substantial windscreen and protects the rider very well from air flow. A smaller screen arrangement which allowed more airflow over the rider might allow more air into the Hornet DS to limit fogging. Couldn't say, as I've only ever used the Hornet DS on this bike.)
I live in New England, and ride all winter, using electric gear when the temps get below freezing (usually just jacket and gloves, but pants and socks if things get into single digits and I know I'll be on the road for hours or more--I've done numerous rides where I've spent 15+ hours per day on the bike, for several days at a time--Boston-Oregon, Boston-Denver (winter ride), Maastricht-Pizza, Minuteman 1000 24-hour rally, etc.), so the whole fogging visor thing really made things interesting, especially at night. Very, very happy to have clear visibility again.