Hi Guys,
my wife and I have been using Shure SM58 for
a while with our PSR-8000. We plug it first through a Mackie mixer than the keyboard.
A friend of mine told me recently to try out
the AKG 1000C wich he has used in studio recordings with good results.
We tried it and liked it right away. More clarity, better frequency response, more power etc.
Try it out and see if you like it.
Have fun,
Eric