Have to agree acrylic is stronger, better insulator than glass, lighter, but the reading that starphire is clearer isn't the honest truth.......Starphire is comparable to the clearness of acrylic........
Acrylic tanks will set you back a bit more, but I've gotten qoutes from probably from 1 of the top acrylic guys on a 300 done in 1" w/external overflow "coast to coast" and cost was $2500.00 drilled as well, so the price of $5k is really steep..... Check around there are tons of good builders and it might be worth the drive to pick the tank up to save a few dollars........