Newbie here, I am in the process of ordering seasoned firewood for the first time. Most places offer a cord of 16 to 18 inch wood or a cord of 14 inch and under. The manual states a maximum of 20 inches. I am a first time burner and do not want to buy the incorrect size wood. Will 16 to 18 inch wood be too tight inside the firebox and make managing the fire more difficult? On a side note, most prices I'm getting for a cord of seasoned oak and cherry wood are between $175-$200, plus delivery. Anyone from NJ/NY area paying the same?