Well, I dont know what materials cost in Cleveland, but here in Buffalo its almoast prohibitively costly. Also, when researching, please make SURE you get tempered glass, not window glass. Window glass WILL fail against the weight of water in a fish tank while tempered will not. In either acryllic or glass tanks up to 50g you can use 1/4", and above that, you'll need 5/16" or 3/8" thickness stuff. Properly braced acryllic wont bow all that much and is actually a little more forgiving to setup than glass. Either material requires a lot of practice with silicone (for glass) or IPS Weld-On (for acryllic) adhesives to be good enough to get a watertight seal.
Just a note on cost as I'm not sure how much that affects your decision. I can buy a 30g tank for $30 but to purchase the tempered glass for the same volume aquarium cut to slightly different dimensions (I wanted only 10" wide instead of the standard 12") locally was $72 and the 1/4" acryllic cost for that same tank was over $100. Like I said, prices may be different in your area, but thats what I found here in Buffalo. You can usually get the acryllic at a Home Depot or Lowes (each store is a little different and some dont carry 1/4") and for tempered glass you usually have to call a glass cutting place or a car window repair place. I just looked under the yellow pages in glass cutting.
Good luck