Some quick tips:
Don’t buy anything with a zoom.
I really recommend you get 12 x 50 or 10 x 50.
If you’re buying binoculars with a roof prism (the type that look more compact), don’t get anything cheap or they won’t be good. You can get away with cheapish porro prims binoculars. However, decent roof prism binoculars have come down in price, mainly due to the manufacturing of good prisms in China. You’ll now find the same bits inside many binoculars – what you really pay for is the build quality and factory alignment.
I did a bit of research a couple of months back, read loads of reviews etc..
I believe the following are highly rated:
http://www.ebay.co.uk/itm/Strathspey-new-10×50-Marine-waterproof-Binoculars-award-winning-clarity-/331318778840
I ended up getting some Konus Emperor 12 x 50 binoculars and they are superb, but very hard to find for some reason.