AKG's manual is a very nice resource. They reccomended two microphones - C480 and C391. Both are condensor cardioid with small diaphrams.
Well, the C-480 costs $800 and the C391 costs $540 - both way out of my price range. I'm sure that they are fine microphones but I can not afford them.
Looking on line I found a similar microphone - the Carvin M90. The specifications seem to be almost identical.