Smith I/O ($175)
I've been on the same pair of I/O for four seasons now, and I'm backing them. The spherical frame is large enough to get ample field of vision with good peripheral, but it's not overly bulky and has a good medium-sized fit. The lenses are crisp and easy to swap out before riding, plus the I/O comes with two lens options. The Ignitor Mirror is a perfect everyday lens, or if it's wicked out there and she's dumping like crazy then the Blue Sensor is the go to. They rarely fog up, even during a hike, and the foam seals out the wind when you point it. Style is proper, too.
get them: smithoptics.com