The MM6 might work for you. It's a more modern based arranger. Although it's styles aren't as "full" so to say as you'd find on some of Yamaha's other arrangers.., they styles on the MM6 are more up to date. You won't find any polkas, and stuff like that on the MM6. You'll find some jazz styles, but more modern jazz types--maybe more along the lines of acid jazz for example.
You will however be at home in the "chill and dance" area if you buy the MM6. The MM6 gives you some other options over the S-500.., such as (although basic) voice editing done via real-time knobs. If I remember correctly you can even record real time knob movements into the internal sequencer of the MM6, and they transmit on midi as well. Meaning if you're recording a dance song using the internal sequencer of the MM6 you can do real time filter sweeps.
The MM6 also comes with sequencing software. The software will be a breath of fresh air really in terms of recording as all of the shortcomings the MM6's internal (scratch-pad suffers from) can be done using the software--such as loop recording, quantize, pattern copying, ect.
I've test driven the MM6.., but wasn't as impressed with it as I thought I'd be, but if you're just getting back into playing the MM6 just might be what you're looking for.
The sounds are decent (they're based on the Motif Classic), and the arps are taken from the Motif ES line. The MM6 will also have the mega voices too.
Good luck,
Squeak
[This message has been edited by squeak_D (edited 07-27-2007).]
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.