Hi, i would go with that starfire glass if you can. I think that's what it's called. Glass scratches just as well. Think about it. The things that you're going to do that scratch your tank are going to be things like dragging rock along the wall when you're aquascaping or something really careless. Like getting sand caught in the magfloat so when you drag it across the glass, you get a nice big streak. That's fun.
Find something that fits the dimensions that you want and has great clarity. If you're interested in building a tank to fit your specs, just keep searching this forum. There are a lot of great threads.
Also, think of how you want to do the filtration. If you want to do a closed loop system or something that requires drilling, then you'll probably most definetely want acrylic.
Just my two cents. Have fun.