A backlight would only be tempered glass, not laminated safety glass. One stone chip and BAM, a million pieces.
I'm going to assume a regular production windshield is going to be WAY cheaper than a low volume model, or racecar. And racecar windshields don't have to be DOT legal. I'm also thinking something fairly modern as the older you go, the flatter they seem to be.
Some thoughts:
Mini Coupe (or Hardtop)
Fiat 500
Chevy HHR (it's actually a pretty small windshiled due to the high beltline)
Yeah, not too close, but pretty tall order....