Both Korg & Roland produce very good voices depending on your personal likes, but you have picked two very different instruments. The Korg i40m is a modal contains voices and Styles backing arrangements. The JV1080 is purely sampled voices.
Intrestingly if you bought both of them they would compliment each other very well.

Graham UK

[This message has been edited by Graham UK (edited 12-09-2002).]