I've used stalker and Prescription.
I got the stalkers ages ago when I could see without glasses and they are bloody excellent, great in fresh and salt water. I used to wear them heaps.
My current sunnies are polariesed lenses fitted to my Arnettes because they fit my head well and look alright on me (I don't look like a mutant fly).
Now they were money well spent, they hardly ever come off my head and I cop heaps because of it 8)
Mick