The industry standard Shure SM58's, Roland Drum Machine, Roland Bass Pedals (pedal board) if I am performing solo midi linked to a sound module so that I can select the bass sound that I like, mixed and powered through a Dynacord PowerMate 600 connected to two EV100's. I generally use a Takamine Steel String Acoustic or a Fender Stratocaster depending on the song and the sound I want. I have recently added a 10 inch FBT bass woofer to make the overall sound warmer, even though it means that I have to carry the extra weight.
Dave uses two CD+G machines for displaying the song words on a TV screen, proffesional microphones for performers and has about 3000 song titles for prospective Karaoke singers to choose from. He presents Karaoke evenings whenever required.