hi, i'm looking into getting a mic so i can record things like acoustic guitars as well as vocals. i then realized i need an audio interface to do it. i've been looking in the M-Audio FireWire Solo Mobile Audio Interface (its about $200). it looks like it has really good specs, so i think it would be my best bet. then i need a mic. i don't want to spend anymore than 200 (i'd really only like to go to 150), any suggestions on any of this? thanks.