I guess I'm playing the same genre of music you play Nedim and I would have bought the sx3000 if it just had a sampler built in. there is nothing like sampled darbukas and turkish/arabic sounds. factory sounds never do the same job. that's why I think my SD1 is the best instrument for this kind of music.
I don't use any of the costum styles and very few of the factory sounds. the sampler is very limited but I squeeze it to the limit including double and triple voice msp.
I love the aftertouch and keyboard and this is the only instrument (along with sd5 and other ketrons) where with a single touch on the 8 pads you can always get your 8 favorite sounds. worst feature is pitch wheel and mod wheel- I wish it was same as the sd5. with this feature changed and a little better sampler I think this instrument would have been perfect for me.