Check out www.SchoolHousePress.com for really long dpn's. The brand is Inox. They come in 16" lengths. Addi Turbo circulars have the thickest cord around, but no needle is going to have a cord as thick as the needle itsself.
One of many knitting guys.
CONGRATULATIONS TO AMY AND SHELDON ON THE BIRTH OF THEIR DAUGHTER!
I use the Denise Interchangable needles. The tube in between the circular needles is a size 5. I've never had a problem with my stitches getting "stuck" in between the needles. I've had them for about 5 years, and they're holding up great.