I've narrowed it down to these 4 interfaces for my first foray into Garageband. The E-MU 1616M. Echo AudioFire 4 M-Audio Fast Track Ultra Apogee Duet There have been raving reviews about the the Apogee. I'm considering this one although it's one of the more expensive at $495.00. Some reviewers are saying the newer types of USB are as fast as firewire. The M-Audio is USB. Is it really a problem? It's also hard because the reviews on the 'net are sometimes 5 years old!