i want to order a new board ,please help me with it !

hey guys , i am 153 pounds and 5`8 high , im currently riding a 5`10 18 3/8 x 2 5/16 and i want to order a smaller board cause where i surf the waves arent big and strong, i want to have more fun and at the same time try new maneuvers. i consider myself intermediate, so wich model and size you reccomend ? thanks