The Apogee One has become a pretty popular device with Garage Band but as people outgrow Garage Band, Logic 9 is a pretty large leap in complexity. I think Studio One might be a great alternative. Support for the One is built-in in Garage Band but with S1 there are a couple of steps to get it setup. This video covers the setup, recording with the built in mic, then recording with a direct connected guitar.

Apogee One is a convenient all-in-one portable USB interface for Mac. Normally it's used with Garage Band or Logic, but it will also work well for as part of a compact Studio One songwriting setup. In this screencast, I go over how to set up both "Ones" to work together.