Depending on where you are hunting quail, the 28 is a great choice. Otherwise, a 20 will definitely work. Beretta's 20 gauge O/U guns typically weigh about 6 to 6.4 pounds. Good Spanish SxS guns will run about 6# as well.
Most Browning 20 gauge guns still run close to 7# and the 28's tend to be heavier as they as built on the 20 gauge frame