Re: Mic driver issues
Well good thing that the mic works already. Mine didn't work right away in Ubuntu. Since you tried two mics, if I read your post correctly, then it is probably the driver. Just in case test to see if the external mic works fine on another PC. Ubuntu uses pulseaudio which isn't as compatible as ALSA but is better than 11.xx and before. You can install ALSA and uninstall pulseaudio. There are many guides online to do that. Before that, I would test the mic by doing a local recording and playing it back to see if there are issues with the whole mic or if it is just Skype (there is a pulseaudio to ALSA converter that adds static sometimes to Skype calls). Also check in the ubuntu volume setting to see if the mic is turned down. I have missed this a couple times and it has caused low mic volumes for me. The mic should work in the standard ubuntu audio driver. It is way easier than ALSA to setup. Try the stuff above before switching drivers and reply if anything works or changes.
♫♪♫ You just keep on trying till you run out of cake ♪♫♪