I have owned Korg I3 & i30 & PA50. All 3 are good boards, but voices on PA's are later samples and my opinion better than the i30.
A change to i30 is not recommended unless you try it first and then you prefer it.

Also remember the PA50 is still a current model. The i30 must be 8 years old now.

[This message has been edited by Graham UK (edited 08-22-2007).]