My recommendation if you're going to do a lot of racing to get the best that you can afford don't buy without being able to attend to try it on. Absolutely consider HANS device, built in or add on. If you're going to just use it at this course and maybe one every two years or like that, do what you like but make sure is snell certified. Cant use moto helmets at sanctioned events.
Good luck, have fun, be safe.