The iTrack Solo will allow you to record audio on your iPad, Mac, or PC. It's compatible with all three! The best part is, iTrack Solo has Focusrite preamps in it, so you know the quality is good. You can find more information about iTrack Solo here.
The Focusrite Scarlett 2i2 is an awesome affordable audio interface. This works perfect with many DAWs including Pro Tools 9 & 10. The Scarlett 2i2 has awesome Focusrite pres built-in and sounds awesome. Along with an awesome interface you also ...