I never had good sunglasses either until I really started riding this year.
I also bought some great Smiths that are built around the eye (no gap). Last week I ran into a large grasshopper and it went straight for my eyes and pooff it flew off.
The glare difference is amazing and I would really recommend some good sunglasses. I went for the middle of the road and they cost about $80.00. I take them off as soon as I get back and put them back in the case. If I stop on the bike, they dont come out of my hand....
My problem now is that now that I am use to them, I really would love a good pair for walking and driving.. That is really when I think I would lose them so I am using cheapies for now.
With all the sun warnings though I wonder if the cheapies are a good idea anymore..