Recording

[rbaron]

Are there recommended or best of class external microphones to use with DAW and the iphone?

[pwnified]

Any interface/mic that works with iOS, will work with multitrack. I started to try to maintain a list here: http://www.harmonicdog.com/inputoptions/
This list is long overdue to be updated. There are many lists available, however, if you search for "ios audio interface" or similar.