Well, a simple but acceptable solution would be the Fender Passport 250. I don't know that much about sound systems and this one is easy to operate and comes as a complete set, including two Fender microphones. It has four actual inputs and two stereo inputs which also work for plugging in instruments with a little bit of fiddling around with the sound. I've used it for a 4 piece band (borrowing a few extra mikes). The only thing you'd need to buy that was extra would be the mike stands, speaker stands and maybe a couple of extra mikes. Also it all packs up into a carryable case (too heavy for me to carry but most guys can manage it easily). Oh and they even include your mike cables. There aren't a lot of special effects available but they do have a reverb option. I've used it in some fairly good sized venues and have found that in some cases it was much, much better than the house system. You could probably get all this, including the stands if you shop around, for around $1000 - $1100.