What lens material is recommended for groove mounting in a full-rim frame?

I'm considering getting a full-rim frame that requires the lenses to be
groove mounted. The frame is model Modo 1062, which is pictured here:

http://tinyurl.com/9krgz

What lens material would you recommend for groove mounting? The person
selling the frame said that polycarbonate lenses are recommended for it. He
said that if I go with any other lens material, whether it be 1.67 lenses
or standard CR-39, the lens will be prone to chipping. I don't want to get
polycarbonate lenses because I read that their optical quality is horrible
compared to other lens materials. If I have no choice but to use
polycarbonate lenses, maybe I should consider looking for another frame.

I was planning on getting the 1.67 lenses at Costco fo $70. I know that the
1.67 lens is overkill for my prescription, but I have to consider the
weight and comfort of my glasses because I wear them pretty much all the
time. The 1.67 lenses will probably be much lighter and more comfortable to
wear. However, I'm concerned that the 1.67 lenses will be too thin to be
grooved.

My prescription:

Right:
sphere: -3.250
cylinder: -0.750
axis: 172

Left:
sphere: -1.500
cylinder: -0.250
axis: 180

 

Consider getting a Trivex material, like Hoya Phoenix or Younger Trilogy.
This is a mid index (1.53) index lens that has similar impact resistance and
tensile strength as polycarbonate, but has excellent optics (abbe value 45).
Trivex is very light with a density of only 1.11 g/cm3. Trivex is also more
scratch resistant than polycarb.

Some opticians may not have heard of it, by most independent opticals that
deal with large optical labs (especially that carry Hoya or Younger lenses)
should be able to get it.

http://www.youngeroptics.com/products/trilogy/
http://www.hoyaopticallabs.com/phoenix.htm