As the others have said an Ed80 would be a good choice as the optics are superb and they are robust. I'd mount it on a Vixen portamount or the GS equivalent (I think Andrews has a good price on the GS mount at the moment), that will come in a bit over the $700 you mentioned. If birdwatching and whalewatching is in the wish list you need to keep the focal length relatively short as magnifications over 30x are often unuseable for terrestrial viewing (too much air turbulence).
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