I have the 20x80s that you are considering and I recommend them. However, Steve's advice is sound and I would recommend you start with a set of 7x50s or 10x50s first - you will always use them, no matter what other instruments you have!
You'll need a decent tripod/mount to go with the 20x80s (or the 15x70s) too, but 7x50s or 10x50s you can hand hold relatively easily.
Al.
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