what you're paying for are the overflows and drilling. I purchased a tank the with the same dimensions you gave for $100. It was acrylic. I understand the preference for a dilled aquarium but a HOT overflow can work just as well and you'll be saving yourself a good chunk of change.
Anyone know of any tidbits in the DIY
section about drilling tanks yourself?
, in RE to "a" or "an", a rule of thumb, if the first letter of the following word is a vowel, use "an" otherwise use "a"
so it's either an
aquarium or a
fish tank. :o)