Martha, you could just felt one.
i'm using sz.7 32" circs and my scarf only goes a few inches past the tips. of course, i only CO 37 sts. my yarn is worsted, and i think sz.7 is perfect. for DK, i would try 5 and 6 and see which one is tight without being too tight.
"You can start going to the tanning bed now so you'll look all spiffy in your dress." - my brother
"Beautiful yarn speaks to the soul of a knitter." - Shandeh
"The Swatch is good. The Swatch is wise. Listen to the Swatch." - Sandi Wiseheart