Hi Toymaker. An analogue wireless mic sounds like a good investment.
I would love to post pictures of my robot, Nina, but unfortunately I have to rebuild her because the old mobile base section was never going to be strong enough to move her. It used two heavy Nickel Metal hydride packs and two windshield wiper motors, and that just wasn't going to be strong enough to support a 30+ pound robot. I'm currectly building a new, bigger base to support two wheelchair motors. Once I have something that begins to look cool, I'll gladly post some pictures of my robot.
Airman00, that also sounds like a good idea of installing the microphone directly onto the bot. One question though: Do you have much trouble to Chive's picking up too much background noise. Say there's some music playing on a radio, or the TV's on, or there are a lot of guests talking in your house. In your experience, is in harder to have your bot understand your vocal commands?