How is the Jupiter 80 comparable to the Montage? I tried one in a store a while ago, and it seemed very confusing to use (to me). Also, I wasn't impressed with some of those SNA sounds, like the woodwinds, which had an artificial vibrato to them. Of course, the acoustic guitars were not my favorite, either, just like on the Integra-7.
Above all, the Jupiter lacks the entire SRX library, and if you want to form brass sections that don't just consist of 4 SN-A tones or so, you have to use some medium-quality trumpet sections hidden among the SN-Synth sounds (the SN-Synth sections has some PCM samples, too, but their quality is about FantomX level, nothing special). I know some Jupiter 80 users who complained about the lack of good sections, as SN-A alone is only good for very small sections.
BTW, I just realized once again that the SRX 04 strings are much better than the SN-a strings, too.