The ruler I use the most is an omnigrid that is shaped like a trapezoid...square corners on one end and 45/135 angles on the other end. I think it is 5" wide and about 12.5" inches long. I'm kindof short and for some reason the longer rulers are harder for me to control. I also have a set of squares...12.5, 9.5, 6.5, 4.5, and 3.5. I work a lot with half square triangles and these help me square them up a little bit. And I use a 1 x 6 and a 1x 12 when I'm cleaning up edges and cutting diagonals.