Well I lashed out and just bought Yamaha EMX 2000 Powered Mixer paired with yamaha S115IV club series IV 15" 2-way speakers. All up the whole package set me back $600 (hopefully thats an ok price?) It was pretty obvious that I had no idea what as I doing as the seller told me to get a DI box to protect the mixer as eventually I will damage the input and cause it to crackle? Apparently the Line6 POD HD500 might be ok as it may have a DI built in? The electronic drum kit and mics are also fine, but for keyboards I need to purchase the DI box? Is this necessary for a protection point of view? All I found was that it was necessary to elimanate hum for recording?