I like to use 5 but I don't always. One of the reasons I do is that I always knit an extra stitch or two from the next needle to avoid loose seams and if I am distracted I forget and all of a sudden realize I have all my stitiches on two needles. I like circular needles best for most things and have a set of Denise needles I love. There is no problem interchanging dpns for circular as long as they fit with room to knit. Someone was talking about the "magic loop" and I think that is what I do. Could someone describe that? I can't get my head around it this morning.