I have actually two (closely related) question, please tell me if it were better to split the question into two.
I plan to give life performances some time in the future, not really professional level, but I want it to sound good. The problem is that I play the (electronic) piano and sing. I obviously can't hold a microphone, and I tried to do it with a microphone on a stand, and it quite doesn't work (I do move my head a lot while playing). So it seems that I'll need a headset microphone. How do I know if a certain device is suitable for my needs?
Closely related, most headset microphones I saw are intended as wireless microphones. Can I use them as a wired microphone? Will I need some pre-amp before I plug them into the mixer? Could I eventually use TASCAM DR-05 as a pre-amp? My idea is that I don't mind the wire (I'll be seat on a spot the whole time) and I can get cheaper without the transmitter and receiver set.