just check it out thoroughly before you buy it, the trim at the top, support braces, silicone, chips/cracks - look it over reeeeeally well
price wise it really depends on your location, here i'd say anywhere from 300-500 bucks could be reasonable depending on what all it came with, id pay up to 300-350 for tank/stand/hood/lights but if it comes with filters etc i'd potentially pay more