In the USA the price of the 61 key with speaker version is $200.00 less then the 76 key model without speakers. You can use any laptop hard drive in the 61 key model.
Just today I sold a PA1Xpro to a regular customer of mine who couldn't come into my store because he lives a few hours away and so we did a comparison of the two keyboards right over the phone. In the end, he bought the korg, but for a few important reasons.
First, the Korg has a much nicer feeling keyboard in my opinion. The keys are not only larger but also feel better with the semi weighted keys.
Next, the guitar sounds play more naturally from the keys of the Korg when trying to play the "mega" type guitar voices.
The Yamaha is still easier to navigate on but after using the PA1Xpro, you get used to it very quickly. For midifile playback I like the Tyros better. Songs start instantly and you can revoice your midi files to play the sweet voices rather than the XG voices.
The polyphony on the Tyros is 128 compared to 64 on the Korg but I'm not sure if this will be a big issue because Korg never uses voices with more than 2 wave forms and Yamaha can use up to 4.
The Yamaha is still lighter to carry around.
The styles are very good on both. Some of the Korg styles might be a bit more "beautiful" and the Yamaha a bit less romantic sounding. The Korg has better Rock and roll styles only because Yamaha left some of these off the Tyros. If they had some Stadium type rock styles I'm sure they would be very good as well but there just missing.
Sounds are a personal taste thing for both but I think both are very good to outstanding compared to most arrangers.
I like the way Yamaha lets us control and adjust effects in the mixing console better than the way Korg does theirs.
I think both have very good vocal harmonizers but the Korg does have a balanced low Z input and Yamaha only has the 1/4" high Z input. It is easier to turn on and off up to 4 voices on the Korg because these are boxes you can check and uncheck right from the main front screen.
In rating the two keyboards I would give them both equally high marks but would suggest that the number of keys and user interface would help one make the decision as to which one to buy.
George Kaye
Kaye's Music Scene
Reseda, California