I am looking for an audio interface essentially to record saxophone for practicing purposes (to listen and analyze my playing) and maybe to do some recording over backing tracks to make some recordings for friends etc. I probably only need one input, but an extra can never hurt. I also want to be able to plug my computer speakers into the interface (or monitors when/if I get them) and also obviously will be plugging in headphones for monitoring when recording. This will be done at home with an iMac, so portability isn't essential, but something small is helpful due to limited space. I have a Zoom H2 that I can (and have ) used as an interface, but I use it as a portable recorder and would like something that is intended as a desktop interface. On the low end, I am looking at a Presonus Audio Box. On the higher end, the Apogee Duet (or I guess Duet 2 now). In the middle, the Presonus Firetudio Mobile and the Focusrite Saffire 6. I'm sure the duet is the best piece generally and I can swing the extra cost if that makes sense, but I wonder if I would even notice a difference and if I would likely be just as happy with one of the other interfaces given my use. Opinions on which of the above (or other) interface makes the most sense are much appreciated.