This is just me but I would NOT buy a different solid at JoAnnes. My first choice would be Moda Bella Solids in white. You can usually find it relatively inexpensive on line if you hunt around a bit. Next choice would be KAUFMAN (name brand) Kona cotten. The Kona they sell at JoAnnes isn't always Kaufman.
Hancocks of Paducah and fabric depot both have the moda solid white for $6.00 per yard.