This is a neat little chart that tells what length circulars to use for a given number of stitches. I found it on my facebook feed and it was posted by AllFreeKnitting and Knit-N-Purl!
Get busy and knit something!!
The Fiber Odyssey
This is where you can see all of the awesome fibery goodness I create!!
The Fiber Odyssey 
Handy! Thanks!