I have the Tiffosis and love them. They have 3 lenses, grey, clear and amber. I use them on both my bike and the motorcycle. The service from the company is fantastic. I broke the clear lense, lost a nose piece and the temple pads wore out. I contacted the bike shop where I got them and Tiffos sent me all the new parts FOR FREE! The vents work well too. Nothing is perfect, but they clear much faster than those without the vents.

I think Nashbar has them for about $40 right now.