Hey Ashton, well as the 2 main differences between the 2 guitars are the pickups and the bridge then you really could do with trying one out first as it'll sound very different to your JS100.
If i were you, i would sell your JS100 and look for a JS1000 second hand, because to be honest once you get a JS1000 i doubt you'd ever play the JS100 again.
Another option (if you don't really want to sell the JS100) would be to save up and replace the pickups in the JS100 with the same pickups that are in the 1000 (DiMarzio PAF and FRED pickups), then all you'd be left with in the JS100 would be the trem, but, you could get a second hand RG550 from e-b-a-y and use that for my trem-suited performances.
Up to you!
If i were you, i would sell your JS100 and look for a JS1000 second hand, because to be honest once you get a JS1000 i doubt you'd ever play the JS100 again.
Another option (if you don't really want to sell the JS100) would be to save up and replace the pickups in the JS100 with the same pickups that are in the 1000 (DiMarzio PAF and FRED pickups), then all you'd be left with in the JS100 would be the trem, but, you could get a second hand RG550 from e-b-a-y and use that for my trem-suited performances.
Up to you!