I'll looking to get a firewire audio capture devices for REW, TrueRTA and some speaker testing and design use. The two interfaces I'm looking at are the new PreSonus FireStudio Mobile and the Echo AudioFire4. I hope to get a Galaxy CM-140 or 150 with a cal file and use that to start. I hope to get an Earthworks M23 or M30 by fall next year when I can afford it. For my purposes what do you guys think? Are these two units a good choice?