Hi,
take a look to the Korg PA1 X (pro). It's now cheaper because the success.
Another good idea is to combine Tyros with a Roland Discover module or keyboard, because the Roland contains some of the Technics voices, you may miss in Tyros.
And if you need a good organ, the roland drawbar module sounds very authentical and makes it easy to foget the KN special features.
For MP3 playback I would use a MP3 CD player, because so you are ready when someone asks you to play a CD.

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Regards
RF