I would also say that it depends on how good the quality it was made in. For example, my 30 Gallon Oceanic has a real, maple wood frame on the top and bottom. The stand was a well built to, and I got the tank for $80 and the stand for $125 (Yes, the stand price upset me, but I couldn't do anything). I have been really happy with them.
So I'd say that if it is a nice tank, give it $10-$15 more dollars.

So I'd say about $75 would be good for that price.