In reply to Os_878:
Good bins have bright images, focus across the whole of the lens with no distortion, good depth of focus and have excellent colour rendition.
Ignore the X magnification. It just isn't worth it. X8 are just as good as X10 price for price.
Go to a shop. Pick up the most expensive pair, look at an object outside the shop, preferably dark in colour or in the shade. Then pick up the cheapest pair. Do the same, you should notice the difference immediately.
Its also worth while looking out for second hand bins. They are often outstandingly good bargains.