I would stick with the common breeds like RIR, barred rocks, orpingtons & austrolorps if you want brown eggs. Leghorns & sussex for white eggs. There is a reason for these being so popular is because they are generally the best all around birds for the small backyard flock.
My RIR are my best layers for both size and numbers. My austrolorps lay just as many eggs as my RIR but are generally a smaller medium egg. My BR haven't started laying yet, but the eggs that they were hatched from were huge XXL jumbo in size......I can't wait for them to start laying. I did also try and hatch some Delaware eggs that XXL jumbo in size, but none of them made it.
Americanas or Easter Eggers are good. Mine lay well. My egg customers like the green and blue eggs. The birds come in pretty colors, many have neat beards and are hardy.
below some of the eggs is a snow flake and i have tried to look around to see if there is a Key around to see what it means but there is none that i can find, does any one know what that means