Best Microphone for voice recognition project.

This is going to sound really odd.  But I finished a voice recognition program that runs simple computer commands when it hears words I say.  It is implemented in a small room in my office.  I don't want to wear a mic or carry a mic around to control the program (plus I want to impress the boss).  Is there a microphone that is powerful enough to hear what I say no matter where I am in the room?  I am guessing it would have to be something with a preamp etc.  I just want to be able to give a command (I know I will have to talk loud, but i don't want the scream) and the mic relay the sound to my computer.  I have tried normal mics and they don't even pick up if i am yelling. I don't want to spend more than $50.  My program doesn't make any mistakes, so don't worry about background noise, it can sift through it. Thanks.
hunterdnanceAsked:
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ridConnect With a Mentor Commented:
I think you could get a good "hobbyist" dynamic or condenser mike and preamp for under $50 that has enough sensitivity to pick up normal speech from several feet. Since I don't know where you are its difficult to suggest anyting in detail, but an electronics shop of some kind seems a good place to start. Once hardware is obtained I suggest you use "line in" connector on soundcard if you get a good preamp that gives line level output. Otherwise the mic input may be overloaded and give sound distortion.
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