Hey, Vano!

You want to have natural sounds? Go and buy a sampler! You want to have natural sounds in addition to really good digital filters? Go and buy a Kurzweil!

I'm playing rock and metal and IMHO a Kurzweil and a Yamaha V-50/DX7 are really top of the lists. Furthermore you can add nearly every other synth to grow in sound abilities. Look out for the handling you're familiar with and you can't go wrong!

Nothing more than my humble thoughts...

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Greetings from Frankfurt (Germany),
Sheriff ;-)