the olny real problem with pa50 is it's complicated and quite unfriendly OS (i didn't say bad OS...)
but the sounds are really good. triton sounds.
now depends on what you want. i sold my pa50 because i didnt like how the navigation process was, but if you're looking for good sounds... maybe only S900 with it's SA voices would beat it. psr2000... sorry, but no way.
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.