If I was looking to make techno and smoothe jazz, and I didn't have to have an arranger, I'd give the Yamaha Motif 7/8 or the Fantom S88 a close look. I could also include the Triton studio too, but I'm not a big fan of korg's acoustic voices. ( This of course is a personal observation ). Add the AN150 card to the Motif and you have a wealth of dance techno sounds to choose from and create. Roland and Triton have siimlar expansion cards..
If you're not interested in being a one person performer ( one man band if you will ), the Workstation can be a good way to go too as far as value for the dollar. You can add midi programs such as One man band, XG works, etc that will play back any Yamaha styles or other styles converted propely to yamaha format ( There is good freeware available to do this ).
When I create a song, if the beat is going to pretty much stay the same throughout the song, or it's not going to go off in several directions, as let's say a jazz fusion or complicated progressive rock song might ( ala ELP, yes..etc ), I can pretty much do the whole thing on the PA80. I can quickly modify the styles to add my own bass line, spice up the drums, etc. The PA80 is as close tro a workstation as I've sen on an arranger, because of it's detailed editing parameters.
Once I get into more complicated pieces, and I don't want to try to do the drums or other parts in real time, I use software programs like Jammer Pro, Slicy ( and fill in ) drummer, or Jazz4++ to assist me in composing these pieces ( there are other apps available too and some are more complex .. fodder for another topic tho ). With these software types I'm not tied down as much to the same or similar rythym patterns. At that point it makes no difference whether I'm using an arranger, workstation, or software synth. I often employ my Motif here because of the flexibility it gives me in editing voices and the real time controller knobs that I can assign to any midi parameter. Also, it alows for pattern chaning, which allows you to pre make short phrases and insert them anywhere in the song. If the PA80 ever falls a bit short for me, it's in the area of lack of real time midi controllers ( no slider, knobs ). Changing the sustain on a guitar part, or adding slight timing delays allows me to get let's say a strummed sound and I can mute the decay in real time to give that muted feel and then quickly change back in real time.. all tools to give a more realistic feel.
Good luck in whatever way you decide to go. My best recommendation is to spend as much time as you can actually playing and demoing the instruments to help ensure that you come home with the one that's right for you. So many good "toys" out there..so little time and funds..lol
AJ
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AJ