I went thru the same evolution a couple years ago.
Klim Krios fit me extremely well. Was on my way to buy one when a NEXX got in my way for about $400 or so.
Pro - Nexx is light weight, but well built and to me 'belongs' in the $4-500$ category.
VERY good airflow!
super adjustable fit.
integrated Sena com if you buy up to it. I did.
Is extremely comfortable in 100 degree heat on my GSA at GSA offroad speeds (2nd gear and higher).
NO 'kite effect' at plus100 speeds on the highway behind my stock windshield. Even when I turn my head at speed.
Other long distance ADV riders tell me its the best helmet they've had as well.
Con - service from NEXX is non existent. good luck if you have questions or problems.
The com Sena built for them is crap. Worst product in their lineup simply because half the time it just doesn't work. Sena will not support it. Nexx is supposed to. See comments above.
The liner will have a shorter life span than my Shoei's. But it's also $200 cheaper.
If I were riding skinny bikes, I'd get a full on cheap MX helmet. For sure.
Since I ride a fat pig, NEXX is a perfect compromise really. It handles my waterfalls of sweat quite well. The Shoei . . . not so much. In fact not at all. I will NOT take the SHOEI on dusty off road rides. All it does is make sweat- mud inside my lid.
My next helmet, you ask?
It will be Klim Krios. I'll pay the price and give it a whirl. I ride 350 days a year so I try not to let price dictate what I buy (too much). It all amortizes out over the life of the product.
Based on a presentation I sat through with one of the top helmet importers in the country . . . . I would definitely go try on the HJC ADV helmet. It's cheap (in the $2's?) and is built to the high end specs for safety. Might be one of the smartest ADV helmet values right now ........... IF IT FITS YOUR MELON PROPERLY. I think this is the one I'm referring to...... http://www.hjchelmets.com/hjca/portfolio-item/ds-x1-awing/
Come to think of it, I had a HJC lid for road riding a while back. Couldn't find a single thing to knock it.
Go to a helmet fitter. Do not try this at home. See a professional.