WOW, I'd say $500 is overkill. I bought my Canon for $99, and it works perfectly. Beware about getting caught up in specs. Companies want their customers to get caught up in how well the scanner looks on paper. When in reality, about 50% of what you're buying would be for professional use. My scanner is capable of MUCH higher resolution that what I use it for. For posting on the web, I set my scanner at 150 dpi, and pictures are bright, clear, and small in file size. You'd be surprised how well a 150-300 dpi scan looks. Most $100 scanners can scan at 1200 dpi or more.
Rob