Regarding glasses, I can recommend the Serengeti range of lenses. They are not easy to find in the UK. The lenses are not coated so the good stuff can't scratch off. They cut glare really well but they don't really darken things much which means you can easily see the instruments even if flying into sun.
Make sure you don't buy anything polarised as it will play havoc with EFIS/glass cockpit instruments. Make sure the arms are slim so that they will easily slip under your headset ear seals. Drivers Gradient without polarising is a good lens.
I bought mine new online in Velocity frames for US$99 in America instead of £154 near my home. Try Amazon USA as they have a good range.
Good luck.