Adi, I sure am going to be unhappy if you jump ship...

Better play the Korg thoroughly before you sell the E-60
My ears tell me you would be making a mistake..

Or ..are you keeping the E-60..even if you get a PA 500-800..?
I still like the E-60 piano over the PA-800, and other tones too {like Scat}..and the drums are no contest...Roland sounds better to me...
Also keep in mind the edits/covers/and make up tools you will lose...
Of course there are always some nice things on other products...but...at what cost?..
