I like omni grid too. I have the 6 1/2 square, 12 1/2 square, 6 1/2 x 24 1/2 and 6 1/2 x 12 1/2 as well as a triangle. I love them all. If I were you I would consider getting a small square too I use it a lot for small projects. I finally got a rotary guard for my 24" and feel much safer when doing a lot of cutting. I have had too friends with stitches from rotary cutters.