Epu - Sounds like you want too much out of ONE machine. Can you settle for a synth you like and a sampler you like?
Many of us are not interested in sampling, finding that Roland keyboards have a wealth of interesting, customizable sounds, and at a good price.
After many years with an old Roland machine, I went to the music store with a lot of money saved up, prepared to buy whatever sounded the best for my needs. I played Korgs and Kurzweils, and went home with an XP60. It suits my needs, and cost WAY less than some of the others. (Your mileage may vary.)
From your previous posts, it's clear you want a sampler. So get one! When people start wanting ONE machine to do everything, the machine runs the risk of becoming a complicated (and expensive) monster.
I LIKE the fact that Roland has packed different feature sets into different keyboards, offering a variety of modular and affordable solutions. (For example, the XP60 has the same sounds as the XP80, but it has less keys. This makes it a bad choice for live playing, but a practical and affordable choice for somebody who only plans to compose and record with it, like me.)
I hope you find what you need, but you may have to resign yourself to the idea of owning more than one machine.
Good luck!
-KC