Just a "gut" reaction to your post, Cassp, but I think you should make a real effort to try a PA-800 first, before you sell the G70 and the 3k.

Now, you probably could easily get another 3k, or even a PSR-S910 if the Korg doesn't work out for you, but you may wish you didn't sell the G70, as it may be pretty difficult to find another as nice as the one you have.

I would really think this through, and really make an effort to play a PA-800.

I'm not dissing the Korg, but I know I wouldn't make such a big decision without a thorough testing.