I didn't even want to consider bantams, but ended up with two Cochin Bantams (a barred rock and a red frizzle) after having my arm twisted by their previous owner. To be honest, they are so darned adorable, I can't believe I ever didn't want them!
Their feathery feet almost look like flippers and give them the cutest gait when they run. I call them my "tiny jewels."
Gabby, the frizzle, has resumed laying already this winter, and while her little eggs won't fill your stomach, they are fine in scrambles with everyone else's. These two live in their own A-frame coop -- because everyone else here is a full-sized bird and I don't want them to have to fight for feed (the runner ducks like to invade when everyone is free-ranging and suck up everything in the feeder) But Gabby, especially, shows no fear and has been known to run off much larger aggressors. Sally's tactic is to stand and YELL at the others. So much personality!!
They were initially a bit reticent around the bigger birds, but have gotten braver. This week, they decided the coop that houses two Sapphire Gems and two Easter Eggers had a better roost than their own A-frame. So, they hopped up onto the high roost and made the bigger birds share.
Of the breeds you are considering, I've only had experience with Welsummers -- who seem to be at the bottom of the pecking order with the two I've had. Nice birds with beautiful eggs, though.
Whatever you decide, enjoy the adventure and welcome to BYC!