I've owned a number of Shoei helmets by now, easily used my Sena with all of them. I really love their helmets, best brand I've owned. Been running with the Qwest model for a few years, quiet and comfy all day long. Only wish the GT Air fit me a little better (too rough on my ears), as I'd prefer having the integrated sun visor-- swapping out visors, as easy as it is on the Qwest, is still a PITA.
Shoei makes nice modular helmets, too (like the aforementioned Neotec). They tend to be a bit louder and heavier than pure full-face helmets, however, which may be of concern to any rider (me, I'm a wussy when it comes to wind noise, I want my helmets, when combined with earplugs, to be as quiet as possible).
Once you've got a helmet DOT and Snell certified, anything above that price is buying fit, finish, and comfort, not safety, i.e. you can get a perfectly safe helmet for $100 these days, a $500 helmet is going to be no safer. That said, IMHO never underestimate the importance of comfort, it's TOTALLY worth paying extra for, as a comfortable helmet is a safer helmet-- less fatigue makes a huge difference for a rider's focus when riding long distances.