I'm a huge fan of red sex links--Cinnamon Queens, Red Stars, Golden Buffs--whatever your hatchery decides to call them. They may not be a "breed" per se, but I really love mine. Quiet and calm, and tons and tons of giant eggs.
For a more heritage breed, I like Barred Rocks. Rocks are pretty, lay well through the winter, and are good eating.
I have a true dislike of Buff Orpingtons (they never did lay well, and they ate a ton, and never went broody which is their claim to fame, and had no personality) but many people will probably suggest them.