Wyandottes
They lay medium sized tan eggs. About 5 a week. They are supposed to be cold tolerant, but I found they are good in 100* + temps as well as below freezing
Leghorns
I had two leghorns before. One laid about 6 medium to large white eggs a week while the other about 4-5 a week. Depends on the line I guess... I reccomend getting rose comb leghorns as the rose comb is somewhat large, so helps with heat, but it can shrink in winter.
Cream Legbars
These guys lay 5-6 , blue to green blue, medium eggs a week. They are best on heat with their large combs, but do well in winter.
Orpingtons
lay 4-5 eggs a week. They are supposed to lay good sized medium tan eggs, but mine lay small eggs. They are best in heat but do well in the cold.