I will add to the my favorite sizes are an 8.5 x 24 green Omnigrid ruler - it's got an anti-slip on the back. I got it at Joann's at 50% off. I also have a 6x12 ruler that I use alot. I will also say that I bought a 2.5 x 6.5 little ruler by Creative Grids that I like alot and use it at my quilt when i need to draw straight lines. I'd probably be looking at Creative Grids more if i needed the larger rulers. I just wait until I need a specialty ruler before I buy one.