If you are looking to input an electret microphone, such as comes with a typical headset or mobile phone, you will need some way of supplying 5V power.
The options given above will accept standard studio dynamic or regular condenser microphones (48V) but will NOT work with an electret microphone.
If you are in this situation then you are in luck. The E-MU 0202 will supply 5V via a stereo 1/8 minijack and it's cheaper.
Strange this issue doesn't come up more often. I have never seen a product offered for sale (I've seen plans for build your own) that will power an electret microphone independently. Has anyone ever seen such a device?