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I have had barnevelders and still have 1. They are not any smaller than my other brown egg laying hens. They are beautiful birds and some lay a bit darker brown eggs, but not all of them do. The one I have now does lay a pretty egg - not real dark, but I can tell her eggs apart from my other brown egg layers. They do fine in the heat.
I also have a Welsummer (and LOVE her eggs) but she doesn't seem small to me either - she is about the same size as my other hens. I think for the most part, the brown egg layers are going to be larger than white egg layers, and I haven't discovered any smaller breeds, other than bantams. Other than the Delaware (she's my largest), the rest all seem to be about the same size - they are BCM, Plymouth Rocks, SS, Barnie, Welsummer.
Don't forget, most of the smaller chickens lay smaller eggs (with the exception of the leghorns), and if you want large brown eggs, you'll need larger hens.