Do you think it'd be way too big? The king dimensions are 6'4"x6'8", so it'd give us about 3 ft on either side of the bed, and 6' at the end. The closet is small, but there is a 4th br next door that we'll turn into a master bath + closet, so we should have enough storage room. I think at the foot of the bed the 6' would give us enough clearance for a low and long dresser.
I really want a king... we've had a full forever, but w/ baby #2 we'll have a 3rd in the bed again, and I don't want to push her out just b/c we're lacking space. That's what we did w/ DS when he was 15mo, and he did OK, but I think he could have benefited from a few extra months w/ us. He still came into our bed in the morning until he was 2 and started sleeping later. A queen is only 6' wider than our full.