[U]I don't have many circular needles[/U]:
One Boye Aluminum Circular fixed size 8 (5.00 mm) in 16" (40.64 cm) length. Nicely pointy, smooth as silk, and cord slightly thick and fairly stiff.
One Options Nickel Plated Fixed Circular size 2 (3.00 mm) in 24" (60.96 cm) length. Nicely pointy, smooth as silk, and cord is nicely thin and flexible.
One Susan Bates Silverado Circular size 7 (4.50 mm) in 32" (81.28 cm) length. Slightly blunt, slightly textured, a bit grippy, and cord is nicely thin and flexible but join is slightly snaggy.
I currently have a project on each. I wouldn't give any of them away but I'm sure I wouldn't try ML on the Boye even if it were long enough (>24" or > 61 cm).
I know that the length determines the minimum size in the round work you can do with them unless you use ML. I believe I could make a sweater for me (46" chest) on my size 7 with 32" but I couldn't use the the 16" size 8 for my sleeves because it would be to stiff and too short for ML. :doh:
Would you be doing blankets? What else might need the 40 inch cords?[/color]