I've gotten money from the insurance company to replace my damaged Joe Rocket Carbon Speedmaster helmet, and I'm trying to find great options in the $300-450 range. Does anyone have any experience with the HJC RPHA 70 ST? The reviews seem to be pretty good. My main focus is safety and quiet. Any other ideas you can recommend? I have a round head, so I need to stick with either a round or intermediate oval helmet.