The JBL eon10G2 sound great and has a nice size/weight package, but there is NO eq onboard. If you are happy with the KB mixer, or carry an external mixer .... they may be ok for you . They don't stack well on carts because of their shape, but overall - they are a nice little speaker with a better than average sound. Not too much bass but ctystal clear in all other ranges.

The KC300 is a big step BACKWARDS from the big brother KC500. They sound ok, but JUST ok. They have an open back with is no good for bass and they are in a very shallow cabinet (again - no good for full, rich bass)
The mixer section has global eq, so if you use more than one instrument - everything shares the same EQ.

The EV SXa100's do not seem heavy to me. They are really well balanced, small in shape and I have no complaints about lugging them around. The small hiss that comes from the horn is not a factor at most playing levels, but it IS there even with no signal present. Goo tight, bas, clear highs and a 2 band EQ make it a good all around choice.

Barbetta uses a piezo type horn and I think it's a little harsh. The shape of the tweeter is very conical and doesn't give much speread to the hi freq. Therefore - the highs sort of lunge out in a straight line, and they don't sound as smooth as I'd like. The overall size and power is good, and they have pole mounts, but do not tilt back for monitor use like the EV and the JBL. This has become one of my favorite features. I often use the speaker tilted up at the audience rather than on a stick ... it's smoother sound that doesn't point directlt at anyone and give bounce off the ceiling for full coverage.

Did I miss anything ? JBL, EV, Barbetta, Roland...... I think that was all your choices. Gopod luck weeding through all our comments. Make sure you test YOUR gear at the store through the speakers. Don't settle for a CD demo or any other compromise. Set up your own gear and do a comprehensive sound check - this is important to your sound. Do it right.