The glass tank is going to be immeasurably heavier. Ask me, my 25 gallon is a glass tank and it took 4 of us to lift it out of the box when it got here. The acrylic 25 gallon that I got was cracked and had to be returned and I could heft it about on my own. So while the glass tanks are so much nicer quality wise, they also are a weight issue that are hard to deal with when you have to take into consideration that they will also be filled with gravel, decorations and WATER. You are going to be dealing with a LOT of weight so be sure if you get a glass tank that whatever you are going to be putting it on will be designed to hold it. There is a BIG difference in the weight involved.
It may be cheaper and just as well to purchase the scratched acrylic tank if scratches are all the problem is and get a scratch repair kit (they are very cheap and easy to use) and repair the scratches on the acrylic yourself and save yourself the money and weight involved. I really wish scratches were all I had to deal with and it would probably have been the way I would have gone but the tank I got was actually broken on the top and the bottom.
http://www.thatpetplace.com/pet/group/10459/product.web
I realize the things cost over $22.00 but they are good for many uses and with acrylic tanks over the years you will need them many times. You may be able to pick one up at the hardware store cheaper. Sometimes just the words "for aquarium use" cause the price to go up times two when the materials are the same. As long as you plan to do the work and clean the dust out of the tank ahead of time the type of material really does not make a lot of difference. The liquid polish might though so I would not use it on the inside unless it says it is safe for aquatic life. Usually only the outer scratches show up anyway as the water will make the inner scratches "disappear".
Rose
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who moi?
admit its gettin rough!!!!!!!!
**looks around for her pockeybook!! 
