I'm surprised no one's mentioned the Electric EG2 goggles yet. I've been using a pair for a few years and love 'em for their excellent peripheral vision.
Electric does sell various lens tints for them too and while not as quick to change out, like on a Smith I/O, it's still plenty easy.
Here's a pic of me with them using the Gold Chrome lens which is good for bright sunny days (Mt Bachelor Feb 2012):
Setups Past & Present
12-13 Jones Carbon Flagship 163W (Current)
11-12 Salomon Burner 163
10-11 Never Summer Premier F1 161
09-10 Never Summer Legacy 156
05-06 Never Summer Heritage 158
03-04 Ride Timeless 159