leave the post oaks alone. Hickory is ok, very hard and no color. get as much red oak and white oak as possible. Sweetgum is also interesting, if you can get it to dry without twisting too much. Sweetgum is also know as redgum. It comes in all colors from brown to pink to red to green. the best way to describe it is walnut on acid. Alot figure and interest, the drawback is it like to twist cup and warp while drying. It's beautiful but finicky. If you can find any cherry, definately get it. Oak, hickory, ash, and poplar wholesale for between $2-$4 a board foot. Cherry is $5+.