It' s hard to beat the Swift Audobon 8.5x44mm porro prisms. They are now waterproof, have a VERY wide field of view which makes them easier to see things with, and they are under your price. I feel they compete well with Zeiss, Swarovski and Leica for a fraction of the price. They are well known in birding circles. They are a bit large but feel very good in hand. There is also a roof prism design but you lose field of view.