Aim for 1g per pound for a fairly lean individual who works out regularly. Females need a little less. Size should always be controlled through diet and not through training in my opinion. Varying training will produce different results, so if you want to avoid getting big, just don't eat enough to let yourself get big. That way you can still play with exercise (ie. if you want to run faster or get stronger, you can still do it without messing up your training). Good stuff, Why!