AuraLens had one of their optometry people speak to me for 20 minutes, and they grilled me about forges, temps, coatings, and forging habits. Very thorough, they researched it and called back a couple days later and recommended AUR-99 2.0lenses, 2.5s if I forge welded each and every day of the week. I like the lighter shade, because they are more like sunglasses than oxy/ac welding lenses, and offer equivalent or better protection with much better general visibilty.
I bought a pair of 2.0 safety lenses in a large frame with side shields. When I got them in 2002or2003 they were $74. I think they have discontinued that model, though.
I've been totally happy with these glasses. I even use them in the basement shop using the HT furnace.
Any questions, you should call them. They are quite friendly but very professional. We also have didymium lenses from them for doing soft glass work; without them, that sodium flare is blinding. Didymium certainly has it's place.