If you only need 4 mic inputs - the Mackie 1202 series is hard to beat. Beheringer makes a "knock off" thats cheaper, but the mic pre amps are not as quiet.
If your needs are simple, try this approach:
2)EV Sxa100's (powered)
1)Mackie (or other) powered sub woofer
1)Mackie 1202 vlzpro mixer.

Total cost.... under $2500. - Very portable, and very powerfull.