Here's a lexan option that a lot of guys have gone with locally and never looked back (Fast Freddy is a local CACC member).
From their website:
http://www.fastfreddiesfabrications....p?id_product=1
"Are you getting annoyed at having to replace your cracked FFR Roadster's glass windshield? We were! So how about the only solution to put an end to that misery with our CNC machined Lexan MR-10 windshields. Lexan MR-10 is an advanced type of plastic that is truly unbreakable for safety. It is National Transportation Safety Board approved and widely used in many window applications including airplane windows, marine hatches, eyeglasses, face shields, and architectural windows. Oh yeah, and NHRA, IHRA, SCCA, and NASCAR use them as well! Our Lexan MR-10 is crystal clear and uses the latest technology specially coated polycarbonate to offer enhanced durability, scratch resistance and UV protection from the elements. Do not mistake this product with the generic lexans, polycarbonates, or plexiglasses which can scratch easily and turn a yellowish hue with prolonged sun exposure.
Additionally, if you are looking to save a little weight these windshields offer a 13lb reduction over the stock FFR glass as well."
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(Less time searching, more time wrenching & driving)