hockeyflow33
Super Freak
I have no idea where you guys are buying your glass and your acrylic and poly. I go to industrial (and large volume) suppliers for both. Maybe the glass prices at my supplier are just super, but I can't believe they're the absolute best around. I've got images of some big glass panels in my office thread as well as the price I paid for them if I'm not mistaken.
Tempered glass is much stronger than regular plate, so I wouldn't be concerned with that aspect. If you have great prices on acrylic go with it of course.
I was just poking around but I remember as a kid having to get plexiglass for the garage windows because we always broke them and it was always way cheaper than glass. I've been wrong before though!