I'm looking for advice on buying lenses for my glasses. I've decided on the Oliver Peoples Denison glasses in matte black (Size: Large 53-17-135-33-145 http://www.contactsandspecs.com/oliver-peoples-eyeglasses/oliver-peoples-eyewear-denison-10773.aspx) and was a little stunned when they recommended lenses (1.74 high index from Oliver Peoples) that cost $500 in addition to the cost of the frames! I then wandered into an optician in Chinatown where they recommended the...