I owned a Roland EM2000 for a while too - about a year I think. I used it with a Kurzweil PC88mx as my main keyboard on a two-tier keyboard stand - the entire rig sounded good but it was too cumbersome. The Yamaha 9000 Pro was the answer, mostly because it offered the polyphony I needed as well, once I added the PLG150-PF expansion card to it, and the 76-note keyboard for piano as the lead instrument. I now own two and both stay in active daily use. That's not an endorsement though - I have well-documented differences with Yamaha over their lack of support for this instrument on multiple levels. With care my 9000 Pros should serve my needs for years to come, or until their replacement comes along. I'm not tied to the hip with using arrangers either, but for now I enjoy them.

I have to say that if I could have any arranger in the world right now, it would be one of the Yamaha CVP-309 models I think. It's very much like a super-Tyros, with 88 notes weighted action and 128+128 notes of polyphony. I would LOVE to see this instrument in a portable package, but that seems unlikely. Well worth a look-see though.