One thing to take into consideration (depending how your house is wired up) is that usually they will wire plug circuits to 20A breakers, thats not to say that each plug socket is wired to its own breaker, but multiple plug sockets to a breaker. That goes to say that the load of multiple sockets are split to a 20A breaker.
I have dedicated my circuits to certain breakers. Wired straight from a 20A to my lights, another 20A to my plug circuits which runs my fans etc.