Can't help you with the sound of Bon Jovi, but I wanted to mention his keyboard set-up. He uses multiple key sounds and multiple external sound generators and amps the up with one heck of a system. He layers many sounds on some songs and getting that power from one keyboard is not posible. I believe its more the way the sound resonates through the amps that define the true tone you are looking for, more than the instrument itself.
combining multiple tone generators gives him hundreds of note poly. He has some huge sounds. Wouldn't we all want to have his sound. But anyways he gets his sound from more than just one board. He has a real cool video on his keyboards and key playing. He is awesome!