Kirsten, have you gone to the Quilt Barn in Puyallup? They carry tons of King Tut and all the other Superior threads as well as silk, Aurifil and Mettler. I wouldn't go with Rayon since it is too fragile. I have used the Superior Threads Rainbows trilobal polyester and my only advice is to use a needle made for metallics. You will be much happier!