Re: Needing opinions of the JS1600
i own a js6 and a js1600. the js1600 is basically a 're-issue' of the js6, but with some aesthetic changes (finish, tuners). other than that, these guitars are basically the same. the js6 has a slightly warmer tone, but i'm assuming that's because the guitar is 17 years old and is broken in. that being said, the js6 is the best sounding and playing guitar i own. the js1600 is very close.
regarding the js2000, i would never choose that one over the js1600. mainly because the js2000 is basswood (nothing against it, just not the sound i prefer) and the main reason for a fixed bridge imo is simplicity and ease of string changes. if i wanted to fool with a double locking system, i'd just get a js1000/js1200 and a tremsetter and have my choice of floating or locked.