Finding a UV777BK for less than $850 would be really surprising. *The $600 UV's would typically be the UV7BK, black and green. *It's my fav UV anyway, so I'm really happy with that. *If you like the RG7620, then you would probably feel at home on a 2000 or newer UV777BK, as the neck is very similar, unfortunate to me, I really don't like my UV777BK, I'm working on a trade for *UV777GR right now. *The older UV's to me are much nicer, and personally, I like the older style neck joint as much as the AANJ, so it's really not a huge concern for me. *
At any rate, good luck with finding one!!!