You just don't want them too short. I like to use 24 or 32 inch needles for straight, and they come in handy for in the round knitting, as well.
You can easily find larger sized circulars on line; I'm sure Knitpicks has them.
Many people have interchangeable sets so they have the option of changing tip and cord length to suit. The Knitpicks Options set is good and there are extra cords available to store projects on if you need to use the tip for something else. They are not unbreakable, though, but Knitpicks is good about replacing the cords. The set is reasonably priced and the cords are supple.
I love, love, love my Addi set, and have been a big fan of Addi needles forever. They are more expensive, but I've never had a cord come off or break.