Hi Nick,
Although I can't answer your questions, except to say I ordered mine without speakers and I am using a pair of Yamaha MS60s powered speakers which I've had for many years.
After coming from the PSR-3000 like you, I can only say you are in for a real treat.
Styles are virtually the same(there are quite a few new ones), but sound way better, and the T2's voices are just awesome.
As a veteran Hammond B3 player, I was impressed with the organ sounds, especially SA Rock Rotary(leslie on mod wheel).
The SA Saxophone is incredible.
The guitars are awesome too.
I know you'll love it as I did.
Congratulations.
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.