Here's my thoughts:
The Roland KC500 is the only one I like in the kc series. The 300 and 100 have terrible bass response, but the 500 is heavy and awkward to carry. All three models have global eq only if that's important to you. I prefer a mixer that has EQ on each channel.

Barbetta's - same global eq deal, but MUCH lighter, and easier to tote.

Bheringher - this is a touchy area - my dealers all have trouble servicing these products. Samson and Bheringer both has bad track records in my area. The cheap mixers seem to be ok, but I'd avoid the amps.

Carvin - nice stuff, great features, not so powerful. Better suited for small to mid range levels, but really nice sound.

I think in a band situation, I'd use a small mixer and an EV Sxa100. Send your mix to the house right from the EV's output. Use the mixer to get the sound you want on stage.