Go for water-proof, multi-coated.
6x42 or 7x50 is a good compromise between light transmission, magnification and field of view.
Remember, more magnification will also magnify your shaking.
Lots of choices around £200-£300
Don't fall for the marketing-man who will make you believe only a £1,500 pair will do - unless you actually like to pay for their marketing budget and have the money to be extravagant.