I'm thinking about going to fitteds for overnight once DS is out of the newborn / poo 25 times per day phase (hopefully soon!) What is your favorite fitted for overnight? Wondering if the $10 GMD workhorse works as well as the $35 ecoposh... Do you need a doubler with a fitted? What covers do you use? Seems most people like wool, but can I use a flip cover that I already have? Thanks in advance!