This is just a hunch, but from reading all these posts on keyboards on this site after many months...if you're JUST using the keyboard to control your rack and you have no interest in programming sounds --> PC1X
If you want to control the rack but later on program your own sounds...then the 2500X, because the PC1X is just a big controller, as far as I know and understand, you can't make your own sounds with it.
A good musicians sees what he hears, and hears what he sees. - Franz Schubert
Pianists dont have two hands. We have 10 fingers. - Franz Liszt