Thinking: new helmet
The chin bar flips up over the back of the helmet for those who have not seen making it the best of both worlds - a full face helmet or a jet

I very seldom ride in anything but a full face, I like the noise control a full face offers and even in very warm weather I find them comfortable if I lift the outer clear face shield.
Good luck
2.) I need the peripheral vision; i could wear my prescription sunglasses with a clear shield."
If you go full-face, you are going to sacrifice a little peripheral vision -- that's the nature of the beast. One grows used to it and learns to "head check" when necessary.
As far as helmet shapes go, here's a page that let's you compare helmets based on head shapes:
http://www.webbikeworld.com/motorcyc...met-shapes.htm
A "narrow" head -can- be accomodated. I'm the "long-oval" type myself. I'm currently using a Shoei X-SP which has fit well through the years (11, which is old for a helmet!), and have found that the Arai "Signet-Q" series is a suitable replacement. It's way more comfortable than anything else I've tried on (and expensive, too).
Try on some high-end Shoeis and Arais, just to see how they feel (keep in mind that Arai has different models for different head shapes, the only you probably want is the Signet-Q model). If you can find a different brand that's cheaper and fits as well, probably worth spending less. But once you've tried on an Arai, you may be hooked!




