re-reading your post, I realize that you've already got the app and the ftp server set up, so I'll go ahead and add this feature to the options. I'm sure it will prove useful anyway. Thanks for reminding me!
The ideal would be an iPhone app that could send audio to VoxCommando and receive feedback (text, images, TTS). If the interface could be customized to only listen when a button is pushed and then send the audio in realtime until the button were released, then we'd really have something! Unfortunately I know nothing of iPhone development, but I think one requirement is that you have a Mac, which I do not.
The other option is a good quality, small, comfortable, headset that does not use bluetooth. I believe such things exists, but they are very expensive still. Perhaps bluetooth will get an upgrade soon, or something new will replace it with better audio...
I get excellent results with my plantronics headset, but it is big, not very comfortable to wear, and it has over the ear headphones that block out the rest of the world a little too much...